BreakLink removes links you don't like
BreakLink extension will remove links you don't like from the web pages you visit! Also it will replace those links with one that you choose.
Let's say you would like your kid to browse site A but not site B, but site A contains some links to B. BreakLink extension will break those links or remove them entirely from site A so your children can navigate safely.
To add the sites that will be blocked go to Chrome settings, extensions and find BreakLink options :)