Keg Suck and I'll be 18 in two weeks!

[Geek King]

So yeah, it all depends on relationship and whether the person is still an active member of the family.

Heck, I've got an aunt and an uncle whose only real relation is that my grandmother took them in after their father left their mother, and their mother went off to the mental ward after the resulting breakdown. My grandmother was widowed at the time, but treated them just like family, and that is what they became.