Family Issues

So anyone else have issues with your wedding party? My sister acts likes she isn’t really interested in being my bridesmaid, can’t remember dates for fittings, shopping, etc. We first planned a destination wedding to Jamaica, but my dad said “he doesn’t fly”, so we changed the venue to Florida. Now he isn’t sure what they will be doing in a year... so they might not go... I am at the point of just making sure my kids are there and ready to tell the rest they can stay home. So frustrated!!!! We even booked a beach house for the entire wedding party and split the cost with each couple for accommodations. This was SO much cheaper than just booking a hotel and they would be right there for the ceremony and reception. I got “well maybe, but too expensive... “ I don’t even like talking to them about the plans :/ so upset