Wifi Routers Firmware HTTPS Block

Could you please think about including an HTTPS block enable for the next firmware of the XR1000 GAMING ROUTER please?
Just a lot of sites use HTTPS and that allows them through the firewall ... (HTTPS sites cannot be blocked) ... 
It's just that I have a 14 year old son who I want to stop him looking at adult sites. So this block is essential for him so he doesn't spend all his computer time looking at Adults Only material.  I also want to stop him going on gaming sites (such as www.roblox.com) during his study time.

Thanks again