I am very happy to read that the dance went well. Your D is very proud of you and you should have gotten out on the floor and showed them how to dance to Thriller. You would have been the hit of the dance!
The sitting in the driveway is one of two things: 1) intimidation; or 2) he is sitting there remembering that he use to live there and is thinking about what he's lost. I wouldn't sweat it...if he wants to sit out there until h@ll freezes over, let him. He's just being a PIA.
Yes, the mlcer will buddy up w/the weakess of the children. Why? Because that child will not challenge him/her about what she's doing. It sounds like the ow is starting to see the difference in the two girls and will use your D10 for info. I do think that your daughters are smarter than what either of them thinks...
The PA behavior can drive you nuts and have you questioning yourself.
Definitely check into the cell plans and see which package would be right for you and the girls. It's time to take this last piece of control away from him.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
