My grandparents kicked me out when i went to see them for the first time.

Hi! So i am 21F and my sister 28F went to visit my grandparents in their city,this wasnt my sister’s first time but it was for me. for the backstory,my mom passed away 4 years ago and i was super excited and emotional to meet her parents finally…so when we were there,my grand dad out of nowhere brought up all the grudges against my dad. I am not going to define my dad because we can all agree he wasnt a great person to my mom,even to us kids. We have seen extreme abuse in our household growing up. My grand dad started blaming us kids for it as well? And then told us to get the f out… my heart felt broken and hurt. Because thats the only family we really thought we had since our relationship with our father isnt good. well its been a year and my other sister ( not the one that was with me who got kicked out ) wants to go see them. And i am bitter about it because they did this.. should i really be feeling hurt? Am i overreacting? Why do i think it’s weird that my sister wants to go see them after everything they did to me.. like i wouldnt go see them if they did this to her. I would really like some advice here on what to do. I haven’t brought it up to my sister yet,Thank you.