MB. Good for you for saying no. I know I would have caved because it was for work. Heck, I caved so he could go to a music festival and ogle intoxicated bikini clad women the same age as his son. But I don't see the point in making D12 hang with a sitter if I'm not actually doing anything. At least you have real plans.
I'm sorry this is such a stressful time for you. Focus on what you want a year from now and realize this is all part of getting there.
