How do you convince your parents to get you another guinea pig?

you could try saying that your other guinea pig is lonely and and that u want 2 have more of a responsibility in your house to clean another guinea pig (only work if you look after the 1 you've got) try an think of reasons on why you want 1 and explain nicely (worked for me) never raise your voice or go all muddy an slam the door cos you'll never get what you want and never go on and on and on because that will annoy them (even tho its hard to)

hope you found my answer useful