My parents divorced several years ago but for all intents and purposes, they hate each other.

My dad will need to be as far away from my mom and her side of the family as possible. This won't be too difficult at the reception, but what do I do about the ceremony? If I seat him on my side, he'll need to be placed several rows behind them, which is weird. If I place him on my FI's side, where exactly should he sit in relation to my FI's parents and sister?
Wedding planning wouldn't be too difficult if it weren't for my family drama!