To not invite my parents' siblings to my child's wedding

[userzerozerozero]

I need to sanity check my thinking. My son is getting married, large wedding, no budget constraints fortunately. Long back story but I am NC with my own sibling and my parents have not been supportive of me over this however I still have a relationship with them and see them regularly. Our relationship is not positive and my MH around them is terrible. I come from a background where family is everything and there is a lot of pressure to do the right thing in terms of inviting wider family to significant events though I have broken rules around this many times in the past.

My mother's brother and family have been very supportive of me through the ups and downs of my decision around breaking ties with my sibling and have offered support and advice when needed while still remaining close with my parents. They are lovely to my son but they are not close with them IFYSWIM.

Now my son is getting married and we've decided as a family not to invite my uncle and aunt mostly at the request of my son and his partner as they want more friends and a younger vibe. Deep down I'm wondering whether I've gone along with this to punish my parents in a way. My uncle will be deeply disappointed but they won't make a fuss. AIBU to just go along with it knowing my parents will be upset and potentially my uncle as well?

She is not dictating anything. Also she is the person paying for the wedding. Happily, her son and his bride have done the right and reasonable thing and agreed for the aunt and uncle to be invited.

I don't care who is paying, it is their wedding. I know who I would uninvited.

Good result, OP.

Conventionally if the parents are paying then they are hosting.

Anyone is entirely free to pay for their own wedding and demonstrate to their family that they are only interested in people who look young, hip and trendy.

I'd be very disappointed in a child happy to take large sums of family money for a large family wedding whilst excluding close family members on grounds of not being cool enough for the vibe.

I know who I would uninvited

eh?

This is rubbish. Most families agree that parents pay, but the engaged couple come to a mutually accepted invitation list. If there are differences it is the couple who have the final say.
If it was me and a parent was to upset me by inviting somebody I really didn't want attending, or wouldn't invite someone I wanted there, then I'd tell them to forget it and I'd elope to Gretna.

The OP undated that the aunt and uncle are invited. Given that there seems to be no limitation to the guest list in terms of cost/venue, etc., she was not unreasonable in the expectation that these family members should be invited, even if she were not paying for the wedding. Considering that she was paying, it would have been very unreasonable for her son to insist on their exclusion, especially for the somewhat ageist reason he gave.