It belongs to me, it's ___
Answer-mine

It belongs to my father, it's ___
Answer-his

It belongs to her, it's ___
Answer-hers

It belongs to Mr. and Mrs. Smith, it's ___
Answer-theirs

It belongs to me and my wife, it's ___
Answer-ours

It belongs to my mother, it's ___
Answer-hers

It belongs to him, it's ___
Answer-his

It belongs to you, it's ___
Answer-yours

It belongs to the dog, it's ___
Answer-its

It belongs to them, it's ___
Answer-theirs