[Selphie likes a good distraction even if it is from the book she's reading on this hot summer day. She puzzles over the question, at first thinking that there's too many people in the room before she starts to figure it out. She shoots out an answer as soon as she's got a solution.]

I think I've got it!

The mother and father are the auntie and uncle and the parents of the son and daughter. The son and daughter are the neice, nephew and the two cousins.