Show them that you are mature and can handle ANY situation with out their help. Take on some extra chores and help out around the house.
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
say please
I have the same question!
you ask them
make a deal with them and stick to it :)
tell them you want rats
come out of the closet
be a good kid
start out asking for a small animal
Tell them its a Spanish trip and your parents are allowed to go !