I installed the mod and it works great, I had a wife and a kid and it was fun. But for no reason my wife just disappeared. I've been searching all over the place, I even used the whistle. I set her home at my house, I cant find her anywhere and I cant use the divorce function or marry anyone else so i don't know what's going on. Is this a bug and should I just reload the mod?

I can't reproduce any issues with divorcing a spouse that isn't present.

To reset MCA for that world, go to .minecraft/config/MCA/Worlds/[World Name]/ and delete the folder named after your username.