Priority Question

Have a quick question

We have at home a 12Mbit Internet Connection but if my brother is watching youtube or downloading something the ping is getting very high and its not possible to play online games.

How can I priority for example for youtube and downloading lower as the online game.

I tried it but if i make a queue tree i have to limit the speed an thats not what i want :wink:
I tried it with no limit in the queue only with the Priority no success

for the test i used ICMP and set i to priority 1 and youtube and downloading (with layer7 ) on priority 8 no success.
It jumps to the queues in the but the ping is still going up tu 300-400ms. Normal I have 40-60ms.

We have DHCP running in the network so it should work for a IP Range

I was using this example
http://agratitudesign.blogspot.co.at/2013/10/management-online-games-bandwidth-on.html

Maybe someone can help

Christoph