B, I am non confrontational also. It stinks sometimes, doesnt it? But when it comes to my son, get the heck out of my way - LOL!
B, sounds like a good 180 for you. No need to be confrontational, though. But you can tell want you to plan to do in a straightforward way.
"H, I've decided that I really want this princess party for d, so that is my plan. I know she'll love it. I hope you decided to come to my house if it rains, but it is your choice."
