Canwegosoon,
Please don't take this the wrong way, but I think they are trying to send you a hint and you're not getting it. I know they are your family however how many times are you going to let them ruin events of yours before you decide enough is enough?
I know it hurts you and it seems like you're a really nice, caring person however i'd probably (IMO) try to cool it with them for a few months and see if they come around. My husband has a sister whom he's not spoken to in years (she was incarcerated for a bit). I know deep down he's very hurt by their distance, however you can't make someone want to spend time with you.
Hugs to you, and enjoy your own trips to WDW.