Ok thank you for that link to Google’s discussion of SafeSearch! That was quite helpful information about forcesafesearch.google.com, and I then found instructions to enforce SafeSearch at the network level using my dd-wrt router. Any others interested, here are the dd-wrt instructions: https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1060728 (3rd post, by wavracer). They worked well for me.