Thanks for your responses. I've done a lot of thinking about this last night and this morning.
To answer a PP, we don't go to my hometown because we have serious issues with my other relatives. My mother does not understand how I'm uncomfortable around her siblings. They are addicts in constant tangles with the law. Our last trip was partically ugly because my drunk uncles kept saying nasty things about some of my children who are of a different race. So I haven't been "home" in several years.
The fact is we have all grown up and have different interests. These interest are so different that it is hard to create a trip that we all can be happy with. My parents are gamblers. The only happy vacation involves a slot machine. That's fine. We have met them in Vegas several times, but it's a waste when they will only meet us for meals. They won't go to attractions or the pool and my kids can't be on the casino floor.
My sister is a hockey freak. She sold her house because she couldn't afford her season tickets anymore. She has missed family moments, like funerals, because of this.
My other sister is a hermit. She would be called your typical cat lady, except she's a dog lover. Her favorite dog passed away a few months ago. Until then she never left her house unless my father stayed at her house. She told me she was comfortable boarding the other one, but changed her mind.
They think I"m a Disney addict.

We did go to Disney twice a year when we lived within an easy drive of WDW. Now we only go once a year.
This is why I always end up paying for something during their Disney trips with us. I have been doing it for years....tickets, hotels, etc. because they all say it would be easier for me to visit them back home, but since I insist they go to Disney I shold help pay for their expenses. I have never pushed them to go with us. In fact I hate when they come. My mother constantly complains and it's hard to satisify such a large group.
I'm going to pick up the phone and just admit that it might be best if the whole thing was canceled. They will all be very angry with me, but at least it will not spread into something worse during our trip. My kids don't need to witness any of this.
Thanks again to everyone who took the time to express their view. I really appreciate it.