She went into the marriage assuming that it would be a monogamous relationship. She should get at least half of his fortune and the kids as well.
I don’t really care how much of the “treasure” either one of them gets...it will be more than either can spend in their lifetimes. That being said, the kids are not “property” and neither of them should be awarded the kids. Children need both parents and both parents should have equal access to the children going forward.