anyways. I dunno man if it's for school make some shit up. They won't know. Say that your grandma needed someone to help her around the house and you knew a poor orphaned kid who needed a place to stay so you arranged for the kid to stay at your gmas and have him help your gma in exchange for a place to stay.
yeah whenever the teach hands me a lame assignment like that, i make up stories. it's a hell of lot easier than trying to remember an essay-worthy past experience.
Site your grandma as telling you the story. Depending on the timeframe, site your parents. If you need "credible" sources, than you can't really do a story like that can you. wikipedia can't help you there.