English after school baby sitter

We are looking for an English native to take care of our son (7yo) and daughter (5yo) after school for a couple of hours 2 or 3 days per week to help them taking their shower and having dinner. We came back from India last year and we want them to continue to speak English. This idea is more to speak English with them rather than baby sitting them. My wife and/or I will usually be at home. Bath and dinner are just an "excuse" to have consersations with them. We are located in Croix Rousse area.