Help me with this computer modem question plz!!?

OK...ok., so look. hmmm i have 2 computers and a xbox.. i have a new d-link modem.. my dads watching a movie on his labtop on hulu.com downstairs. and im downloading wowclient(game). in the meantime iwant to play xbox live..im afraid it will freeze everyones connection up..the only wireless internet device used is the labtop..if im online with my pc, and my dads withhis.. if i use / play on xbox, will it freeze everyone uP?