Ask HN: Startup in Kids market, and related issues

Our startup idea has a possible verticalization (not a proper word) in kids market (even though it was turned down by YC !sigh!). However, we are so fearful to brand it that way. Just to avoid all the complications around content sanity, inappropriate usage, and you know the whole gamut. We are trying to brand it as a parents market, just to make our life easier. Else the entire focus of development will go childproofing the site. However, from a market verticalization pt of view, we understand that if you have a compelling product for kids, you've got yourself a winner. Any opinion around that?