I think I do understand.
Being with people you greatly dislike is difficult at best. But the thing is...you do want to see your sister. Can you find ways to see your sister without him being there? And if he is there, can you do your best to ignore him?
What would happen if you explain the situation to your sister?
I would set some sort of boundaries or rules for yourself...what can you mentally tolerate and what can you not tolerate? If you find yourself in a situation that you are very uncomfortable with...what strategies can you use to deal with it?
make a list...I can do this but I cannot do that. And "if then" strategies of if this happens then I will...do this.
It is all up to you as to what you are able to do. You are not a bad person if you feel you cannot tolerate another person's toxic presence but you do have to think about your sister too and how you can best support her.
Good luck and tells us what happens if you can.
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