Question 1 - Overbearing In-Laws

This question is for both guys and girls. You are getting married, your mother in-law, sister-in-law feel like they are wedding planners and they are taking over your wedding. They are making decisions that would make you cry on your wedding day. The question is how would you deal with it? Or in some cases tell us your horror stories. And for others what if the overbearing person is your own MOTHER.