At this stage I would make my own will, yes, but perhaps more importantly I would look carefully into protecting my assets in tne event if a divorce.
Because he had his property before marriage, he could make a case for keeping it. If you inherit from your parents while married... who knows?
Your will is a bit academic if he has waltzed off with half your inheritance in a divorce!
I don’t know, OP, it is possible that he has acted in panic over what happened with his brother, and possibly under heavy influence from his family.
Maybe step sideways from the will for a day or two and then have a serious talk about your relationship, and what you want fit each other, yourselves, your children.
Then even if you feel you can restore your relationship make sure your affairs (financial!) are ship shape!
Havjng wills and plans is the grown up way to be. And best approached calmly. He has done it in the throes of panic and grief and presumably anger at what he saw happen to his Db’s assets. His brother may have died a while ago but the will, probate, disbursements will have taken much longer and be more recent in his memory.
He shouldn’t have done what he has done, I’m not saying that.