There are some situations when two dear people can't decide about the inheritance and can't come to a common decision. It is really awful and I can't understand such people. It seems that they lack any feelings at that moment. How can one discuss who gets the parents' belongings?
Sometimes it can end up in a lawsuit. Of course the relationships get worse. But just think: Would your mother be happy looking at you arguing about who gets what? Of course not. Everyhting should be decided in a calm way. Don't behave like animals who see a piece of meat and are ready to kill each other for it. Think about family relations first.