Long story short - a year and a half ago we had a holiday to Center Parcs to celebrate my dads 60th birthday. My step mum planned it but complications arose when we were all going to be staying in the same lodge with her daughters dog (my then 4 year old was and still is petrified of dogs) without her asking us if we were happy in same lodge or not she booked another which we thought because she was scared of us giving her covid. Anyway, there was a big falling out and we no longer speak. Her daughter is due to be married next year and as a family we had all been invited (myself, partner, daughter and bump at the time who would be 1.5yrs old at the time of wedding) so we’ve just received a ‘wedding reception’ invite and no longer invited to the whole day. Says they aren’t having kids at their wedding which is fine - one day when they have kids I hope someone tells them they can’t have their children attend some function. Anyway - due to not seeing my step mum/sister since said incident I’m now thinking we will politely decline? Or shall we turn up and go? I’m not expecting to make amends but if we don’t go we will look like we are just as stupid as them for falling out with us in the first place? What should I do?