I don't have any pics, but I did pull you an extract from a "first appearances" list I keep.
A couple notes:
-The "first appearances" listed are the first time the name was used, not necessarily the first time they appeared on-panel (ex: Garth's parents appeared probably 15 years before they got a name).
-Although I didn't draw a continuity distinction for relation (ex: XS was a reboot character, but the Flash first appeared in preboot continuity) if a character's name changed across continuity, both names appear below (again, using XS, "Dawn Allen" is listed, and later on "Dawn Allen-Ognats" is listed).
-Pol Krinn, Danielle Foccart, Grev Mallor, and Mekt Ranzz aren't listed as they have a different categorization in the list I'm pulling from (though you should be able to find those fairly easily).
-Extended "Super" and "Flash" family members aren't listed (otherwise this would be mammoth)
-Sorry for any clerical errors (awkward concatenation or otherwise)
Anyway, here's what I've got, chronologically:
Superboy's Father, Jor-El (Jor-L), was first named in the Superman Daily strip (1/1939)
Superboy's Mother, Lara (Lora), was first named in the Superman Daily strip (1/1939)
Superboy's Adoptive Father, Jonathan "Pa" Kent , was first named in Adventure 149 (2/1950)
Superboy's Adoptive Mother, Martha "Ma" Kent , was first named in Action 158 (7/1951)
XS's Grandfather, Barry Allen , was first named in Showcase 4 (10/1956)
XS's Grandmother, Iris West-Allen , was first named in Showcase 4 (10/1956)
Supergirl's Father, Zor-El, was first named in Action 252 (5/1959)
Supergirl's Adoptive Father, Fred Danvers, was first named in Action 279 (8/1961)
Supergirl's Adoptive Mother, Edna Danvers , was first named in Action 288 (5/1962)
Supergirl's Mother, Allura, was first named in Action 291 (8/1962)
Timber Wolf's Father, Mar Londo , was first named in Adventure 327 (12/1964)
Brainiac 5's Father, Kajz Dox , was first named in Adventure 335 (8/1965)
Brainiac 5's Grandfather, Pran Dox , was first named in Adventure 335 (8/1965)
Brainiac 5's Great-Grandfather, Vril Dox , was first named in Adventure 335 (8/1965)
Sun Boy's Father, Derek Morgna , was first named in Adventure 348 (9/1966)
Chameleon Boy's Father, Rene Jacques Brande , was first named in Adventure 351 (12/1966)
Cosmic Boy's Mother, Ewa Krinn , was first named in Adventure 352 (1/1967)
Cosmic Boy's Father, Hu Krinn , was first named in Adventure 352 (1/1967)
Ultra Man/Phantom Woman's Daughter, Arna Nah , was first named in Adventure 354 (3/1967)
Timber Wolf/Light Lady's Son, Bran Londo, was first named in Adventure 354 (3/1967)
Timber Wolf/Light Lady's Son, Brin Londo II, was first named in Adventure 354 (3/1967)
Ferro Lad's Brother, Douglas Nolan , was first named in Adventure 354 (3/1967)
Timber Wolf/Light Lady's Daughter, Loni Londo, was first named in Adventure 354 (3/1967)
Ultra Man/Phantom Woman's Son, Ronn Nah , was first named in Adventure 354 (3/1967)
Chameleon Boy's Second Cousin, Doyle Brande, was first named in Superboy 147 (6/1968)
Polar Boy's Father, Mintar Bannin, was first named in Superboy 148 (6/1968)
XS's Mother, Dawn Jae Allen , was first named in Adventure 373 (10/1968)
XS's Uncle, Donald Wallace "Don" Allen , was first named in Adventure 373 (10/1968)
Celeste's Uncle, Leland McCauley III, was first named in Adventure 374 (11/1968)
Matter-Eater Lad's Mother, Mitz Kem , was first named in Action 381 (10/1969)
Matter-Eater Lad's Father, Rall Kem , was first named in Action 381 (10/1969)
Mon-El's Descendent, Eltro Gand , was first named in Action 384 (1/1970)
Matter-Eater Lad's Brother, Renkil Kem , was first named in Superboy 184 (4/1972)
Princess Projectra's Father, King Voxv , was first named in Superboy 206 (2/1975)
Ultra Boy's Father, Crav Nah , was first named in Superboy 208 (4/1975)
Ultra Boy's Mother, Mytra Nah , was first named in Superboy 208 (4/1975)
Karate Kid's Father, Kirau Nezumi , was first named in Superboy 210 (8/1975)
Karate Kid's Mother, Valentina Armorr , was first named in Superboy 210 (8/1975)
Element Lad's Father, Arn Arrah , was first named in Superboy 211 (9/1975)
Element Lad's Mother, Valla Arrah , was first named in Superboy 211 (9/1975)
Phantom Girl's Brother, Gmya Wazzo, was first named in Superboy 215 (3/1976)
Colossal Boy's Cousin, Rogir Allon , was first named in Superboy and the LSH 232 (10/1977)
Shrinking Violet's Father, Arn Digby , was first named in Legion of Super-Heroes v2 263 (5/1980)
Chameleon Boy's Aunt, Ji Daggle , was first named in Legion of Super-Heroes v2 263 (5/1980)
Colossal Boy's Mother, Marte Ida Allon , was first named in Legion of Super-Heroes v2 263 (5/1980)
Shadow Lass's Mother, Tarnia Tolarn , was first named in Legion of Super-Heroes v2 263 (5/1980)
Colossal Boy's Father, Wynn Allon , was first named in Legion of Super-Heroes v2 263 (5/1980)
Tyroc's Ancestor, N'hura , was first named in Legion of Super-Heroes v2 265 (7/1980)
Tyroc's Ancestor, St'balla , was first named in Legion of Super-Heroes v2 265 (7/1980)
Chameleon Boy's Father's real name, Ren Daggle , was first used in Secrets of the LSH 3 (3/1981)
Chameleon Boy's Second Cousin's real name, Theg, was first used in Secrets of the LSH 3 (3/1981)
Princess Projectra's Cousin, Pharoxx, was first named in Legion of Super-Heroes v2 286 (4/1982)
Princess Projectra's Grandmother, Hagga , was first named in Legion of Super-Heroes v2 288 (6/1982)
Colossal Boy's Wife, Yera Allon , was first named in Legion of Super-Heroes v2 305 (11/1983)
Star Boy's Father, Fryd Kallor , was first named in Legion of Super-Heroes v2 306 (12/1983)
Star Boy's Mother, Mira Kallor , was first named in Legion of Super-Heroes v2 306 (12/1983)
Dawnstar's Father, Mist-Rider, was first named in Legion of Super-Heroes v2 311 (5/1984)
Dawnstar's Mother, Moonwalker, was first named in Legion of Super-Heroes v2 311 (5/1984)
Invisible Kid II's Sister, Francine Foccart , was first named in Tales of the LSH 314 (8/1984)
Dream Girl's Mother, Kiwa Nal , was first named in Tales of the LSH 314 (8/1984)
Lightning Lad/Saturn Girl's Son, Graym Ranzz , was first named in Legion of Super-Heroes v3 10 (5/1985)
Shadow Lass's Grandfather, Sarven Mallor , was first named in Secret Origins 8 (11/1986)
Cosmic Boy's Ancestor, Jason Krinnski, was first named in Cosmic Boy 2 (1/1987)
Dawnstar's Brother, Greatfire , was first named in Who's Who in the Legion 1 (4/1988)
Dawnstar's Brother, Greybird , was first named in Who's Who in the Legion 1 (4/1988)
Duo Damsel's Father, Humre Durgo , was first named in Who's Who in the Legion 2 (6/1988)
Ferro Lad's Mother, Luiza Karamonte-Nolan , was first named in Who's Who in the Legion 2 (6/1988)
Duo Damsel's Mother, Silvou Durgo , was first named in Who's Who in the Legion 2 (6/1988)
Celeste's Cousin, Leland McCauley IV , was first named in Who's Who in the Legion 4 (8/1988)
Phantom Girl's Father, Byzjn Wazzo, was first named in Secret Origins 42 (7/1989)
Phantom Girl's Step-Father, Khard Wlessey, was first named in Secret Origins 42 (7/1989)
Phantom Girl's Mother, Winema Wazzo , was first named in Secret Origins 42 (7/1989)
Devlin O'Ryan's Mother, Megan O'Ryan , was first named in Legion of Super-Heroes v4 1 (11/1989)
Lightning Lad/Saturn Girl's Son, Garridan Ranzz , was first named in Legion of Super-Heroes v4 3 (1/1990)
Ferro Lad's Father, Andrew Douglas Nolan , was first named in Secret Origins 47 (2/1990)
Chemical King's Mother, Darvon Arlik , was first named in Secret Origins 47 (2/1990)
Chameleon Boy's Brother, Liggt Daggle , was first named in Legion of Super-Heroes v4 6 (4/1990)
Chameleon Boy's Mother, Zhay Daggle, was first named in Legion of Super-Heroes v4 6 (4/1990)
Laurel Gand's Daughter, Lauren Gand , was first named in Legion of Super-Heroes v4 8 (6/1990)
Kono's Mother, Bel An'nan , was first named in Who's Who v2 1 (8/1990)
Laurel Gand's Father, Zavrel Kama , was first named in Who's Who v2 2 (9/1990)
Lightning Lad's Father, Luc Ranzz , was first named in Legion of Super-Heroes v4 12 (10/1990)
Lightning Lad's Mother, Perla Ranzz , was first named in Legion of Super-Heroes v4 12 (10/1990)
Kent Shakespeare's Mother, Laura Shakespeare , was first named in Who's Who v2 8 (4/1991)
Kent Shakespeare's Father, Rob Shakespeare , was first named in Who's Who v2 8 (4/1991)
Timber Wolf's Mother, V'Layla "Nanette" Keeley , was first named in Who's Who v2 8 (4/1991)
Lightning Lad/Saturn Girl's Daughter, Dacey Ranzz , was first named in Legion of Super-Heroes v4 20 (7/1991)
Lightning Lad/Saturn Girl's Daughter, Doritt Ranzz , was first named in Legion of Super-Heroes v4 20 (7/1991)
Mon-El's Father, Kel Gand , was first named in Legion of Super-Heroes v4 Annual 2 (11/1991)
Mon-El's Mother, Marisa Gand, was first named in Legion of Super-Heroes v4 Annual 2 (11/1991)
Devlin O'Ryan's Father, Ethan O'Ryan , was first named in Who's Who v2 16 (2/1992)
Wildfire's Brother, Squire Burroughs , was first named in Legion of Super-Heroes v4 27 (3/1992)
Cosmic Boy/Night Girl's Son, Pol Jath Krinn, was first named in Legion of Super-Heroes v4 Annual 3 (7/1992)
Star Boy's Wife, Yvyya Val , was first named in Legion of Super-Heroes v4 Annual 3 (7/1992)
Chemical King's Father, Volta Arlik, was first named in the LSH Sourcebook 3 (1/1993)
Mon-El's Brother, Del Gand, was first named in Valor 13 (11/1993)
Cosmic Boy's Ancestor, Krinn Magar, was first named in Valor 20 (6/1994)
XS's Cousin, Bartholomew "Bart" Allen II, was first named in Flash v2 92 (7/1994)
Phantom Girl's Cousin, Enya Wazzo, was first named in L. E. G. I. O. N. 69 (8/1994)
Kinetix's Brother, Thanot Saugin, was first named in Legion of Super-Heroes v4 66 (3/1995)
Triad's Mother, Iruna Durgo, was first named in Legionnaires 24 (4/1995)
Triad's Grandmother, Murlu Durgo, was first named in Legionnaires 24 (4/1995)
Chameleon's Father, Gozz Daggle, was first named in Legionnaires 25 (5/1995)
XS's Mother, Dawn Allen Ognats, was first named in Legion of Super-Heroes v4 Ann 6 (6/1995)
XS's Father, Jeven Ognats, was first named in Legion of Super-Heroes v4 Ann 6 (6/1995)
Alchemist's Mother, Garra Arrah, was first named in Legion of Super-Heroes v4 71 (8/1995)
Apparition's Father, Luonel "Murl" Bordo, was first named in Legionnaires 28 (8/1995)
Alchemist's Father, Tarn Arrah, was first named in Legion of Super-Heroes v4 71 (8/1995)
Saturn Girl's Father, Bertor Ardeen, was first named in Legionnaires 38 (7/1996)
Saturn Girl's Sister, Jancel Ardeen, was first named in Legionnaires 38 (7/1996)
Saturn Girl's Mother, Sydne Ardeen, was first named in Legionnaires 38 (7/1996)
Mon-El's Ancestor, Cil Gand, was first named in Superman: Man of Steel 60 (9/1996)
Ferro's Mother, Nancy Nolan, was first named in Legion of Super-Heroes v4 85 (10/1996)
Kinetix's Mother, Azra Saugin, was first named in Legionnaires 42 (11/1996)
XS's Aunt, Meloni Thawne-Allen, was first named in Impulse 24 (4/1997)
Sensor's Father, Charlz Wynzorr, was first named in Legionnaires 49 (6/1997)
Sensor's Mother, Katren Wynzorr, was first named in Legionnaires 49 (6/1997)
Sensor's Brother, Wyllm Wynzorr, was first named in Legionnaires 49 (6/1997)
Magno's Brother, Lev Magz, was first named in Legionnaires 53 (10/1997)
Magno's Brother, Omar Magz, was first named in Legionnaires 53 (10/1997)
Magno's Sister, Trin Magz, was first named in Legionnaires 53 (10/1997)
Live Wire's Uncle, Vaz Ranzz, was first named in Legion of Super-Heroes v4 106 (7/1998)
Live Wire's Mother, Dalya Ranzz, was first named in Legion Worlds 2 (7/2001)
Live Wire's Father, Kirth Ranzz, was first named in Legion Worlds 2 (7/2001)
Ultra Boy/Apparition's Son, Cub Nah, was first named in Legion 9 (8/2002)
Invisible Kid's Father, Lon Norg, was first named in Teen Titans/Legion Special 1 (11/2004)
Invisible Kid's Mother, Ryna Norg, was first named in Teen Titans/Legion Special 1 (11/2004)
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