Family situation

My mom and Dad can’t be in the same room together. My relationship is a lot closer to my mother and my relationship with my father is mending. Without going too in depth to personal stuff, there’s just no way. On top of that, the guest list is all my mom’s side of the family, and I really don’t want the talk of my wedding to be just the fact he was there. How can I politely tell him that I will have to have two parties, one where I celebrate with my mom and her family. And another where me and my fiancé celebrate with his family.