My kids dad wants to take them to his oldest daughter's bday at a public place. He always does joint parties with his daughter's other mother even though she is married. I don't like her and don't want my kids around her or her family. I think it's unnecessary. If my bd had a separate party for his oldest they could go. But I don't want them going to a joint party with the bm. Oh, and bd and I are not together. We have no court ordered visitation. I have no problem with him coming to get them any other time but that weekend I plan to have them stay home. Am I wrong?