I have a sister-in-law who is very selfish. She has to be the center of attention and she is quite rude. No one in her family stands up to her and it drives me nuts. They don't want to hurt her feelings, but what about everyone else, and isn't it doing a disservice to her. Also, her kids are following closely in her footsteps and I will not stand for my children being treated badly. I need advice, this might not end well.