Friend not invited to her daughters wedding

Your friend should send congratulations and ask to see pictures. She can't get the wedding re-run, can she? and if she never allowed the SiL to darken her doorstep, I can see why she wasn't invited to the wedding. Either she had good reason to ban her SiL in which case she wouldn't have liked the wedding, or she hasn't got good reason to dislike her SiL and wouldn't have been top of anyone's guest list. And the same go for the relations who've never invited him to anything - why should they be on the guest list?

Maybe it's time for your friend to accept her son in law?
It's been 7 years if not longer?
The atmosphere would of be horrible thinking about it..
Would she of ignored him?

My mother in law wasn't invited to our wedding because of her dislike/ horrible attitude towards me. It was my husband's choice. Not mine.

Time to leave the past in the past I think.

Sorry, posted too soon! What should my friend do? She is furious and upset at the moment. Just communicating by text. She thought she had a close relationship with her daughter.

I can see both sides, I think that to never allow the father of her grandchildren into her house, was extraordinary.

Any thoughts, ideas?