You don't HAVE to drop your relationship with her family. Sometimes LBS have a fantasy the WAS's family will choose the LBS *over* the WAS long-term. That's rare. What's not rare is some people who had good relationships with their ex-inlaws maintain them through a divorce. You are no longer their daughter's husband, but you are still bound to them as their grandchildren's father.
Emotionally, I cannot do that right now. Indeed, they wouldn't take sides, and would still treat me the same as before. I just don't have the headspace, I'd feel miserable inside and don't think I could fake looking like all is well. I appreciate it's my lizard brain telling me to avoid and wanting to just move on already. I'm using up enough resolve to keep it together at home.