i dont know what your level of technical skill is but if you wanan make your brother feel all warm and fuzzy you could configure a m0n0wall or pfsense box (
m0n0wall pfsense ) to prioritise gaming trafic its the same pricipal as a gaming router just cheeper if you can find an old pc and get a cheep hub. dont quote me on this but i belive pf sense can also do per ip balancing so you cold guranty him atleast 1/2 the b/w more than hes getting now if you take a the 3 meg