My family have been horrible about my fiancé due to a 10 year age gap (I'm younger). We have 2 DCs and a beautiful life together but he's still not accepted.
Booked to get married this year abroad and just finalised today - going to invite both sets of parents and no one else. The thought of drama makes me want to vomit.
I have lots of siblings and so I know the backlash will be horrible. To the extent that it's dampening my excitement already.
YABU - just invite them and see what happens on the day
YANBU - it's your big day and you can do as you please