How do you call a person is like an animal doctor?

where
whose
which
who

ответ:

do you know the wilsons? they*re a very friendly family.

определенный артикль the ставится перед именами собственными (фамилиями), обозначающими целиком всю семью. 

is he good at math?

was she there last year?

were they hungry when they arrived?

are you nice to work with?

is it pleasant to deal with him?

is this book hard to get?