How do you deal with over dramatic relatives at a funeral?

Grandma's funeral is Friday, I called our local paper and put an Obituary in for her so all her friends who we could not find their numbers could know of her passing. Apparently the fact that my half siblings were mention as part of 9 grandchildren and no in laws were mentioned (THE LADY WRITING THE OBITUARY ACTUALLY TOLD ME THEY DON'T MENTION SON AND DAUGHTER IN LAWS BECAUSE IT CAUSES CONFLICT AND PEOPLE CALL YELLING AT THEM) passed off my uncle's wife. My uncle called my aunt flipping out on her that 9 grandchildren were mentioned and not the 5 who are from the 4 siblings. Here's the thing, my grandma considered my half siblings as her grandchildren, she was GRANDMA to them as well and they're heartbroken she is gone. I couldn't leave them out and the news reporter said that they would be counted as the grandchildren and she would not mention they were step grandchildren. The reporter and I went over this obituary with a fine tooth comb purposely editing it and re drafting it to avoid offending anybody. She and I were on the phone for more than an hour. Now I could have been spiteful and just mentioned my siblings and myself and how much she meant to us. The reporter didn't even mention my dog like she said she would, but I'm not mad about it. I was highly pleased with the obituary as was friends who read it. I'm just frustrated. There is no need for anybody to be carrying on the way my uncle's wife is carrying on. He also went as far as to yell at my aunt (his sister) that he is speaking at the funeral and he is speaking first. I don't care I'm more than happy going last because my words are my own and not the words of anybody else. We sadly had to warn the Rabbi about the bulls hit he's going to be walking into and he joked about the fact that my aunt is a "goyim" who is causing too much trouble and that Friday will be all about celebrating the life of my grandmother.

I am actually highly relieved that moving forward from Friday that they will not bother with us until she sends my uncle for the diamond earrings, now that grandma is gone we can even go back to setting the house alarm which I told my aunt we should change the code so when he attempts to break in it can't be disarmed.

I have never been more highly disgusted with people and I know they have a right to be at the funeral but it's all a show to his wife. She's going to cry and carry on like she loved and cared about my grandma meanwhile my grandma never liked her. The woman thought she was marrying into a rich Jewish family and in the end it turns out we weren't rich at all. My uncle's wife was never liked by and of the elders in my family. My great great aunt always called her by the wrong name on purpose and my grandfather was only afraid that he would tell her.how much he hated her while he was on his death bed. My grandma always had her pinned as a troublemaker.... If there is any reason why my mom doesn't get along with her brother and her oldest sister is because of the shit storms this woman is forever creating.

I feel like if she makes a scene at my grandma's funeral I won't be able to contain myself. I've been waiting YEARS for the day I don't have to deal with this woman again.

I just keep reminding myself that God don't like ugly and karma will get her.

Any advice on how to make it through the funeral without wanting to tell everyone to go home because it's all an act for them?