With luck, it might be that now that you're getting married it'll be easier for your boy to put distance between you and them- He has his own family now, and though you're not going to get rid of the in-laws completely, they should respect that they're not entitled to be a centrepiece of your relationship anymore. If they don't, that fucking sucks, but it's their problem to deal with and you aren't obligated to try and reconcile.

No more family dinners where guilt is the main course, hopefully.