Are my family here? should also be accepted, shouldn´t it?
I googled it to find a better explanation than I could give, so here it is: "My family is- this is correct. Family is a collective noun, which is considered as a single group." So it is a single noun. Family is, Families are. Hope that helps.
For what it's worth, the sentence has been updated to include are since the above comment was made :)