Since it is a negotiated separation agreement, if you are not present, the agreement is invalid. If the contents of that agreement are written according to parents' wishes, it doesn't matter whether you two brothers agree or not. This agreement is equivalent to the parents' will. No one will object if parents don't change. If you think the agreement is unreasonable, you can communicate with the elderly. Let's negotiate again. When negotiating, it is best to invite village cadres to participate. I think the old man will agree. Village cadres should also sign and seal the written agreement. The agreement signed and sealed by the three parties has legal effect. There is a similar situation in my family, and there are too many legal provisions, so I won't list them here.