A Conversation from the Back Seat

So, as we are driving home from swimming yesterday afternoon I say to the boys that Drea and Tim are coming to babysit.
Jacob says "Tim is coming too?"
Gavin responds "yeah, cuz Drea loves him."
Jacob replies, "they're married."
Gavin -"to each other."
I think the obvious to me, but maybe not to them made me laugh.