Don't put parental controls on it. What do you want to control? Maybe put controls on the website that they can visit, but that goes on the DNS or router. Most kids will go to a mate's house that doesn't have any or as harsh parental controls anyway if they are particularly keen on seeing something that they 'shouldn't'. Parental controls are a fix for parents who can't talk to their kids; they make the parents feel safer but just send the issues underground. Gen X will have been writing code for a while at your child's age. I was. There was no choice if you needed to unlock a game you could've afford. At that time GUIs were a bad overlay over MS-DOS or DR-DOS. You had to know what you were doing to get the best out of it. Your kid will be fine with any distribution of Linux. If your kid is technically inquisitive likely to be good at maths/science, get them installing Arch. If not and they just want to use a browser, install one of the top five popular distributions from distrowatch.com. The Office suite for Linux is called LibreOffice. If you use Chrome as your browser you'll easily tell if your child has been on bad sites because your timeline will be filled with adverts for unsavoury impotence remedies. Enjoy.

PS printers are still bastards in Linux. Happily they're less bastardish in Linux (and Mac, because Linux and iOS use the same printing software) than Windows. If you like your life buy a decent Laser from anyone but HP - my generation bought the last decent HP printers they made.