But this is beginning to cause resentment. Tell your dad and his fiancee exactly what you have told me. You and your sister are not asking too much. In fairness to all concerned, an adjustment needs to be made. Invite Alice's family to join your family for one, warm, blended family event.
Life is too short to feel resentful.
She said that was a fair price to ask, since it was less than some of the fancy hotels were charging for a New Year's Eve party. As it turned out, they had a dozen guests or so, some inexpensive entertainment and decor, and a catered meal. While it's the rudest thing I've ever heard of, it's so outrageous we're still laughing about it. I swear this is a true story. I applaud you for laughing at the outrageous situation.