W told me I needed to figure out what the "f*ck" I was doing about the party and added "regardless of whether OM was coming, and he's not coming, your concern should be what is best for your daughter and not what is best for you." I replied, "but if I was to act inappropriately because OM is there, then my not being at the party would be in the best interest of my D." With that W handed the phone to D and D and I chatted playfully for about 15 minutes.
Go to the party. Be your D's dad. By being absent, you show your D that you are weaker than your W and her OM.