There appear to be some folks around here who are less supportive of free speech than they claim.
#Nostr is meant to be a place where anyone can post whatever they want and the only way they end up having their voices silenced is if all relays decide not to host their notes, or all clients decide not to fetch their notes.
That means there is bound to be content, whether it be language, images, videos, or ideas, that is not suitable for children posted here. Deal with it.
The answer it not to censor the person who posted content you don't like or don't want your child to see. The answer is for you to be a PARENT and take responsibility for what your children are and are not able to access.
You can have only 1 of the following:
A. A censorship resistant communication protocol where anyone can post whatever they want without fear of being silenced by those who disagree with them.
B. A safe space for children to interact online without seeing things they shouldn't yet be exposed to.
Nostr is not a place for children.