Humma do not have families the way we understand them. 

An older male finds a younger female (such pairings are often arranged by their Houses), and they mate.  The young female gives birth.  She then becomes a male.  Then, as a male, he seeks out a new female to mate with.  He is still legally bonded to the male that fathered his first child, and they are still raising that mutual child.  But now he is expected to continue the line, and so now he is the father of his 2nd child.  This is how the Houses work.  Each House is a quasi-family with a neverending stair-step structure.  Every individual Humma parent is linked to the older spouse before it, in an unending chain.  Each parent is like a generation by itself.

Several of these "generations" live together in one household - female children, the young female parent, the older male parent, the male parent's previous partner (who is like a young grandparent or uncle now), and any other prior male or neuter partners, and so on.

Gender roles as we know them would be alien to the Humma.  They would see females as young and naive, and would see males as experts in the ways of childbirth.  Experienced Humma midwives would all be male.  Neuter individuals would be seen as wise and tough.  After all, how many Humma survive into old age?

The concept of homosexuality as unusual would not exist, since the Humma have to go through a relationship with someone who changes gender!