It's okay if someone you strongly dislike gets an inkling that the feeling is mutual.
Like the creative writing workshop advice goes, if one person tells you a piece of feedback about your story, that's just their opinion, but if ten people give you the same note, there's probably something worth paying attention to on the input side.
Your house, your rules, so spell them out from now on and give your son-in-law a chance to surprise you.
Soft rejections, mixing finances, and a primer for dealing with loaded questions.
Here is blanket permission to not worry very much about offending people who neither show up to your parties nor ever explain why.
"Don't touch me" isn't complicated. You know who makes it complicated? CREEPS, THAT'S WHO.
"You dumped me, remember? Kindly sigh into someone else's moving boxes."
If you don't know what to say, revert to first principles: Something is probably better than nothing.
When you want to share an extremely mood-ruining thing (death of a parent) without ruining the mood: Be brief and direct, and let other people be nice to you for a minute.
The question u asked: "How do I decline future social invitations from people I don't like anymore?"
The question I answered: "It is okay to outgrow friendships and only RSVP 'yes' to the parties you want to attend."