"Avem două familii."

Translation: We have two families.

[jh963]

Can familie be used in the sense of child?

[razvan.marin]

No.

[Jake_78343]

So familii is feminine even though it ends with two i's? Is that common?

[abcdefg-1]

"Familie" ends in e and is feminine. The last e is replaced by i in the plural form and yes, that is pretty common: alifie (ointment), bucurie (joy), copilărie (childhood), decizie (decision), elegie (elegy), poezie (poem), rochie (dress), soție (wife), tărie (strong liquor), etc.

[Hormazd9]

What does it mean?
It means we have two family name?

[ngel41311]

It can mean that you have your father's family and your mother's family, e.g.