1) Don't force or expect them to lose or gain weight for your wedding. They're your closest family and friends and you love them because of who they are, not how they look!

2)Don't force them to pay for things that aren't in their budget. Like making them hire a makeup artist, hair stylist, or manicurist for the day of the wedding, or buying an expensive dress/suit, expensive travel and accommodation, etc.
Be mindful that not everyone can spend all that they have on your wedding. Make your bridal party comfortable enough to where they're actually happy to be a big part of your day!

3)Don't forget that their lives don't revolve around your wedding- so if they can't make it to certain appointments or events, be understanding!

4)Don't treat them like they're your personal assistant or personal chauffeur by making them do all your chores, or drop you off everywhere you want to go. They're your loved ones, treat them with that respect!

5)Don't expect them to answer every call, email, text, or DM the second you send it. People have very busy schedules and will get to your messages when then can.