Google announced the Pretty Please feature during Google I/O. Parents can now control what apps their kids can access using Google Home. Google Home will learn their voice when you set them up on it so it can tailor the experience. The process to link each child’s Google Family Link account to Google Home was relatively painless, taking less than 5 minutes in total for each child. At present there’s only an option to let kids use third-party Assistant apps, but you can at least control what kind of apps your children can access.”]
Source: https://www.cnet.com/home/smart-home/how-to-set-up-parental-controls-on-google-home/