Ответ:

Tom: Are Linda and her husband coming to our party tomorrow night?

Helen: Yes. Their daughter is coming too.

Tom: Did you remember to invite James and his wife?

Helen: Yes. but I don't think his (or their) sons are coming.

Tom. Oh yes. Tony and his brother are in Spain for the summer holidays.

Helen: Shall we invite some of your friends, then?

Tom: Yes. Why not?