Should i go to my sisters wedding?

my sister has banned me from seeing either her or my nephews for the last 3 years because her husband to be was jealous of my relationship with his children as he is strict and overbearing so whenever i spent time with my nephews we had a right laugh and they always looked forward to seeing me again, however she is getting married next week and turned up on my doorstep a few days ago saying she wanted me and my family there,the thing is she hasn't bothered with my eldest son for the last 3 years and she hasn't even seen my youngest who will be 2 in july,she only lives about 2 miles away yet like i said she didn't wanna know and told me i wasn't allowed to see my nephews,which kinda hurt to be honest, my brother lives 500 miles away and is on the verge of a breakdown and pretty ill but she is putting pressure on him to drive up just for her wedding, although she has never visited him in 6 years,i feel like she only wants us there so the photo's look good,should i go?