I always saw the Ranzz family as an anomaly on Winath. Every other Winathian we saw in previous versions of the Legion was one half of an identical twin pair. Garth and Ayla were really two singleton births that just happened to occur at the same time. Mekt simply had the bad luck to have no other egg fertilized at the same time he was. Of course, in this new continuity, maybe we'll find out that Mekt had a twin who was a still-birth, and maybe that early trauma was the beginning of Mekt' s downward spiral into villainy.
Except for the Reboot, Spark's origin story in Legends of the Legion 2 and her spotlight in Legion Worlds 2 had a lot of male/female twin pairs.
I am fine with writing experimentation of differing family relationships after a thousand years. My only hesitation is the consequence of no male/female relationships being shown so far suggests that such relationships may be rare. Where does this leave such classic legionnaire relationships such as Garth/Imra, Jo/Tinya, Val/Projectra, Chuck/Luornu? Will the legionnaires follow the new norm or be rebels and recreate the ancient male/female relationship?
Well, we have Cos and Tasmia so far.