"Hol van anyátok?"

Translation: Where is your mother?

[Arcaeca]

Why not az anyátok?

[vvsey]

It works both ways, with or without "az". I don't know, it may be a special case for relatives. Or "anyátok" is treated like a proper noun. Something like that.

[smileyowlie]

"Anyátok" here could be rude, why not have "édesanyátok" or "anyukátok" instead?

[SchlachterZoltan]

"anyátok" isn't rude, the "az anyátok" expresion it is.

[guntunge]

First we learn those forms are possible:
az autótok
a ti autótok
a nektek az autótok

And now, with family, a proper form is even rude???

But "a barátnőd" is not rude?

[jzsuzsi]

a barátnőd is not rude. Az anyátok / Az anyád can be consudered rude, because some people use it as a short version of "a k..va anyád" (and that middle word is rude)

[MrtonPolgr]

"anyád" can sound rude regardless of the article, probably "anyátok" is used much less commonly as swearing ("anyátokat", though...)