??Advice??

So I was on craigslist the other day and I happen to stumble upon an albino adult female hedgie! I really want a hedgehog but I haven't asked my parents yet, and they will only so interest if I show I am committed to hedgies. It doesn't give the hedgehogs exact age (but it said she is ready to breed so Im guessing between 1 and 2 1/2) What should I do to tell my parents I am ready for that responsibility. (I have been researching for just over two months) :?: