My ex and I separated and he doesn’t come around much. He is engaged to be married and plans to move to California with his fiancée and her son. He wants our children to visit for Christmas which I declined. But he also wants them to move to California as well. My issue is he’s not involved in their life and I don’t know her. He feels as though they need him more than me but I’ve been the one taking care of them since we split. Am I being a selfish mom for not allowing them to move in with him and her?