FMIL doesn’t want to come to our wedding

I am currently planning a very small intimate wedding / elopement for this September. The original plan was just my parents, FH mom and sister and a best friend for each of us. Very small.

However my FMIL and FSIL have had absolutely no interest in our wedding from the beginning, they can’t even be bothered to remember the date. They don’t want to talk about planning, opted out of dress shopping And whenever anything wedding related is brought up they act as though they know nothing about it. My FSIL has always been the favoured child and the other week my FH finally stood up for himself after some poisonous things were said. FMIL + FSIL have said they are no longer coming to the wedding.

For me, I could care less as they havent played a large role in our life except when asking for favours and I know those who truly love and appreciate us will be there. But I know FH is deeply hurt by this as he feels they are all he has for family.

Any advice? Should he distance himself from his chaotic and negative family or should we attempt to find a way to include them just because they are family?