Please someone help me

I have a question I have had nothing but problems with my FH family. They wanted to be involved I put them in the wedding they never went to get thier dresses when asked mind u had 6 months to plan I gave a deadline they got upset so I kicked them out too many headaches. Now I get the news that they are all planning on buying $300 dollar dresses and dressing alike to the wedding unbelievable I am very upset now. I don't feel this should be happening this is my day only the bridal party dresses alike am I wrong????? :

You will never have problems like you'll get w family. Id have your FH talk to them. Thats unacceptable! They couldnt cooperate before you kickes them out?

But if they do show up like that peoplw will think theyre idiots once they realize theyre not in the WP