My sons and daughters

If you have two nouns, of different genders, how would you make an adj. like my agree?

filii mei (my sons)

filiae meae (my daughters)

filii et filiae m–? (my sons and daughters)

I was thinking the my would just be masculine, as you see in modern Romance languages, but I wasn’t sure.

Masculine plural is the usual method of agreement between people of both genders, though it sometimes just agrees with the nearest noun. There are more options when you are talking about inanimate objects, e.g. _uirtus et honor sunt _____.