German for kids

Just wanted to ask if there are any students out there who are native German speakers and have some experience teaching children? My son is 11 and we're looking for a German tutor who is not too expensive (some of the fees on tutor type websites are bit eye watering for me!). It would be good to get him back into German with a few lessons over the summer hols. He has some basic German but doesn't want to learn from me!

There doesn't seem to be much out there for children. And yes I've heard of German Saturday school and looked into it, but it's no good for us as my son isn't bi-lingual.

Thank you!