I would suggest some type of QoS option on your router. It won't keep your pings as low as when your brother isn't using the bandwidth but depending on how you had it setup it could bring you sub-100ms pings no matter what he's doing.
If you are able to get a faster connection however this will further alleviate problems + with your own QoS setup you will be able to game reasonably and have somebody watching youtube etc at the same time.
I personally have a custom built router so I can really detail in on what type of traffic goes where at what prioritization level if I wished. This may not be available on most commercial routers.
Connected with O2 Broadband Standard 8.6Mb/1.2Mb
Edited by LeJimster (Sat 22-Oct-11 20:13:26)