GSA offers a range of services available to federally recognized Native American Tribes, from surplus property donations to vehicle purchases. In addition, recognized tribes can use this page to receive notice of GSA actions and policies that affect tribes, as well as provide comment.
A high school student with little or no experience would normally earn much less than an experienced adult. All other factors aside, teenagers are often more than happy to babysit for $5 per hour whereas an adult with a number of years experience as a nanny or sitter would expect at least $10 per hour.
You should pay your babysitter by the hour. Between $10 and $15 per hour would be reasonable for a teenager or young person. If you're using a professional babysitter you may need to pay $20 or more per hour.