Surprise Disney Trip!

My little cousin is turning 10 and as a surprise, my aunt and uncle are taking him and his brother to Disney Land. I was asked to join to help out with the kids in order to let my aunt and uncle to have some alone time because they don't get much time to themselfs with their busy careers and running their kids around everywhere. I'm currently 21 years old, I live on my own, and I work full time. I would love the oppurtunity to go on a vacation and spend some time with my family. I live in a different province so I don't get the oppurtunity to see them much since money is very tight right now.   Honestly, any amount would help alot and of course be greatly appreciated. Thanks in advanced for everything!