Honestly, you can't convince them. Either they will let you or they won't.
if your parents wont let you get sponsored, well, id yell at em.
you say parents are going with
I have the same question!
you ask them
tell them you want rats
be a good kid
come out of the closet
make a deal with them and stick to it :)
say please
Tell them its a Spanish trip and your parents are allowed to go !
You don't. If you want one get it when you are 18.