My mil and fil are in their 80s.
They've recently updated their will.
Dh has two siblings and three kids, and I have three kids.
Their estate is to be divided into 4.
One quarter to each kid, the remaining quarter to be divided equally between all the grandchildren, INCLUDING MINE. This is not going to go over well at all!!

Dh three kids don't speak to their grandparents much. They don't call or write or take time off work to see them when they're visiting. They don't invite them to dinner or to sleep over. They don't send cards or thank you or buy gifts for chirstmas. My three kids do all those things for them.

Should I try to talk them into changing this?

MY Parents won't leave his kids anything. They despise the skids and hate the way they've treated me all these years.