How do I Set Parental control on iPad?

How do I activate Parental Control on YouTube?

Thank you, Alex, for the explanation. Which one (fluid design or responsive design) is better for a mobile website?

I gifted an iPad to my sister's kid yesterday. I now feel a bit uncomfortable about what websites she might watch. How can I block all non-child-friendly websites on her iPad?

I have two young kids, and my wife always allows them to watch YouTube videos to distract them while we work. Recently, we started worrying whether it is safe for them to watch YouTube without our supervision.

Is there any solution that allows my kids to watch only family-friendly videos?

I am new to web designing and confused with the terms of responsive and fluid designs. Can you explain the difference between fluid design and responsive design? Which one is better for a website to load on mobile devices?