[Ceretrea]

Hi, having rescued and now bred robos I've seen quite a few. I have to say that all but two pairs fell out eventually. The first pair to live together was an older female that I introduced to a young female. The other pair was a mother and daughter.
Both pairs carried on interacting with me just fine.

Based on this, I'd say its a dominance type of relationship that works best when your robos can clearly define who is in charge I.e. One is older or one is a parent. I know someone who introduced an older male to a younger male and that pair worked. But an older/younger pair when both boys were equally bossy did not work.

I rehome singly as pets because I have had mixed pairs where the male was killed by the female so would rather not risk it. When they fatally fell out, they worryingly made no noise about it (I keep my dwarf breeding pairs close to my bed) so its not necessarily going to something you will know about.

I do sometimes retire mums with a daughter as I'm confident this dynamic works.