yeah i agree with your parents. I wouldn't take the job
because its $60 a day right? what if they don't pay, should you ask.. or what if they just forgot.
and IF you ask.. it'd be awkard... if u know what i mean...

and soon they would think you should be doing it for free since its your bf's grandparents.
I know they might seem like oh yeah everything's finee =) they're glad to pay you etc etc
but if your really serious about your relationship i would rather not take that chance.
because in the end. from all my experiences.. people DO talk... -_-"