Fil is marrying his OW.
Mil died a few years ago.
Fil had a very public affair with his OW for over thirty years.
The way it was carried out meant that it was very humiliating and damaging to dh (from age 12) and mil used to confide in dh about it even when he was young
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Dh is not NC with fil, but keeps his distance. He knows his fil's relationships are nothing to do with him, but chooses to stay out of it, and will not accept the ow as part of the family. I fully support dh, fil is a great big twat mysoginist who has form for saying nasty things about me, so reduced contact is great, and life is much more peaceful for it.
The woman gives us all dirty looks if we see her out and about, no idea why as we've never met her socially or even had the opportunity to speak to her, which has led to the dc not liking her without understanding why.
There is now gossip that they are to get married, but we haven't heard anything official. My older two (15 and 13) have heard this too.
I feel we should explain to them why dh and I have taken a step back, and why we wouldn't go to a wedding. I think they need to know because I don't want them growing up thinking that their grandfather shouldn't be with someone else because she's not their grandmother. I don't think it's realistic to expect someone to remain single and lonely if they have the choice.
I would explain in simple unemotional terms what happened, in an undramatic way, so they understand, but at the same time let them know that if they want a relationship with fil and his gf, that's fine and up to them, and if they wanted to attend the wedding, that's also fine, but they would understand why dh and I weren't there.
Full reconciliation between dh and fil isn't an option. I'm trying to find the best way to deal with this so the dc can understand and don't grow up with unrealistic expectations of relationships beyond death.
Sorry, this is long, but I would appreciate some opinions on this!