Wanted: Writing tutor for 6th and 4th grade

Hi,
We are looking for a private tutor to help our two kids with their writing, grammar and general English skills. They are in 6th and 4th grade. Our focus would be on writing. We can pay 15 dollars an hour. We are looking for sessions once or twice a week after school either at Stanford or in Los Altos. We'd like to start as soon as possible. We prefer someone with excellent writing skills.

Thanks