I know that Tibetans practice Polyandry. I have friends too who have multiple fathers.

According to ma Gramps(who wus there preMao) it was a system that was fully accepted in the Tibetan culture.

And my uncle who participated in that GAAAU FARKAAAA programe remember mentioning that in some of the Tharu and Maithili culture(in remote western parts of Nepal) too.