Nobody had wanted to think about the time their mother could not take care of herself. She had always been there for them, and they kept putting off discussions. Upon her passing, with no known will, the fighting ended up in court and took a heavy toll on the family.
Regardless of whether your children get along during your lifetime, there is no way for you to predict how they might act after your death. Make the provisions in your estate plan while you can that will protect them against conflicts with each other after you’re gone.