Possessive pronouns

There was a party at Debbie and Nick´s house last night. The children are tidying up.

Jenny	These POPSHOP magazines aren´t (my magaines). Are they (your magazines), Debbie?
Debbie	Well, they´re Nick´s and (my magazines). We buy them every week. But these comics aren´t (our comics). Are they (your comics), Sita?
Sita	No, but why don´t you ask Ben? I think they´re (his comics).
Nick	Debbie! There are ten CDs here in the living-room. They aren´t (our CDs). Ask Jenny and Sita. Maybe they´re (their CDs).
Debbie	They´ve got (their CDs), Nick. What about Mum? Are they (her CDs)?
Sita	What about these socks? They´re in my bag, but they aren´t (my socks).
Debbie	Are they old and dirty? Then ask Nick. They must be (his socks).