How Should I Describe My Employment as a Nanny on a Resume?

by Anonymous
(Somewhere)

I am a college student, but will have to put my studies on hold because of financial situations. While in school, I've been working as a nanny with the same family for 3 1/2 years now.

I go to classes in the morning and after school I go to their house until the parents get back from work. I pretty much serve as a parent, since I take them to their sports activities, go shopping (groceries, clothes, school supplies, etc.) for the kids if they need anything, am familiar with the kids friends and their families, etc. During the summer I am with them all day long.

I am now having to look for a new job where I would be able to get paid more and save up for school, but I am not sure how, if at all, I should write down my job as a nanny. It is not really a professional employment, but I do not want to leave a gap since my last job which was a sales associate at a store in 2005.

I was also wondering what was the best way to call it instead of "nanny." Is "caretaker" a better option? Should I add it at all?
Thanks