Ha ha this sounds somewhat similar to what I just did...well, not really I guess. I'm going to college in the fall and my parents and I have been arguing about where I will go so I made them a power-point presentation outlining the reasons why I want to go to a certain school. I made sure to include all of the possible expenses as well as a bunch of other stuff. Well, I think that you should make a power-point presentation for your parents outlining why you want guinea pigs. Be sure to include everything about costs of living, life span, nutritional needs, etc. You should check out
www.guinealynx.com and read
EVERYTHING! As well as
www.cavycages.com so you can figure out where you can put your cage as well as how you are going to build it, that site also has a
ton of information about the care and keeping of pigs. Hopefully this helps. Good luck! (Oh, just a side note, please read the information about proper capitalization and posting etiquette, everyone on the forum will really appreciate it and it will save you from being yelled at and banned)