Baby Sitter for July 20 - Jul 24

Hi! My Family is visiting Basel for week of July 20. I am traveling for work so i will need to work during the day. We are looking for baby sitters between 2PM and 8PM for my 2 kids age 4 and 7. Childcare will be based in the apartment but it would be great if you can visit the nearby parks with the children. We are visiting from California and the kids speak English only. Thanks Nakul