My grandma and grandpa had a joint will in which their children are each considered with 50%. Since it is a joint will, it could not be changed even after my grandpa’s death. My grandpa knew why he did that...
Sometimes it also states what happens if the children are no longer alive. Maybe you are not even heirs, but only have a compulsory portion claim. I think such a case was posted here in the forum before. So read it carefully again.
I am just afraid that they will somehow drive grandma out of her house. She wouldn’t survive that. Another possibility would be that they persuade grandma to sell them the house and grandma can live in it until her death. If grandma wants that, it wouldn’t be so bad. But I could imagine they would then mercilessly throw her out.
If she has a lifelong right of residence, then she cannot be thrown out. Besides, she is not just anyone, after all she is their mother.
If we are supposed to decide about her affairs, that could be seen as unfair too, right?
I think her daughter, who visits her every week, can decide about her affairs better than you as a grandchild who lives 500 km away and only comes by every few months. So it would not be equally unfair, but actually more unfair.