I'm going to include a few very subtle jabs at the bride's single older sister who has been cruel to her all her life
Why do you want to make fun of the bride's older sister?
She won't shut up and stop crying when her sister is finally happy.
I can see why you'd want to say that, but I think it's better if you didn't include anything mean about the sister. Sometimes it's better to say nothing at all, rather than say something mean. It is wrong to create drama.
I don't care what you think.
You run the risk of causing a big fight at the wedding if you do. You should be there to support the bride and not cause a fight.