[Fey]

Well, I've read what you, and everyone has said in response. So, take this with a grain of salt.

First off, it sounds like they've used this on you a lot over the years and it's always worked to their advantage. So, sadly they're going to fully expect you to fall into line. It sounds like your father is also pulling the same thing on you, albeit a bit better than your sister.

First off, tell them flat out you are not going, but others are more than welcome to head out. If they say anything else inform them that you're very sorry, but your choice is final. At that point you need to stop listening. They're going to pull all the guilt they can find to hit you with.

They've gotten away with it for a while, so they're going to fight it hard. It's going to require some serious spine on your part, and it may cause some backlash. But, if you hold firm they'll start pulling it a lot less.