I think you are right where you are supposed to be for today....
You are seeing both sides of the road, while staying on yours.
The blessings, the anger/resentment from it all.
In time, the anger will subside and the blessings will continue and eventually 'win' out.
I remember feeling very similarly, and a poster here named Bworl told me that if I didn't feel that way, then he would have more concern for me.
It's a normal part of seeing it all, before you deal with the emotions of it all....
As far as family ?
That's a razors edge my friend...
Allow what you can handle, dismiss what you can't. It's easy to forget that our families had created a relationship with our Exes also. They spent the same amount of years celebrating births, marriages, family events, etc with our past spouses.
So they have to grieve the loss of family as well, and if you throw fuel onto the Mama Bear, or Papa Bear, well....
Imagine how you feel when something threatens the well being of one of your kiddos...
You seem to have a good relationship with your family, so boundaries prolly aren't necessary, or maybe they are fairly soft.
Just a "hey, could we possibly not talk about her today? " if it isn't something you want to hear about. In time though, it will become nothing more than hearing about a neighbor or an old friend from high-school.