MrsD: I've been where you are right now, and even now feel things like that creaping up on me. Crap 6 years ago I would borrow cars that she wouldnt recognize from friends and follow her around. Trust me when I tell you that there is NO good that can come of that. You know their hanging out, they probably do have plans for the weekend...all you can do is accept it and keep going forward.
Tell me this, if he were to call you right now and tell you that they were going away this weekend and thats why he needed you to watch your son would it change anything?