After a safe search engine for children? Try KidRex if you like. It's based on a Google custom search engine running in safe mode, with additional website data. I'm not sure of exactly what age range it's good for, but I'm guessing that it's not focussed on a specific age range, it just keeps out the 'naughty' stuff. Unfortunately, it keeps it out too well. So, no searching for blue tits I'm afraid. Or 'breasts' although you can do searches for chicken breast recipes and breast cancer.
I did manage to catch it out on a couple of terms, and I've emailed them about those - so it's not perfect, but nothing like this ever will be. It also just returns webpages rather than image, video or news search for example.
Nice cheerful interface:
[Edited to add: I got a response to my email detailing the inappropriate material about 4 hours after sending it with a confirmation that one racist website has been removed and they're working on a filter for another ambigious term. Full points for that.]