My internet connection?

[undead gamer]

ill be blunt, i like to play on XBOX Live but to have fun and play i need a 4 bar connection like everyone else to be even and not die all the time (i play Call Of Duty). But my internet connection is extremely slow because my mom works at home and takes up a lot of the internet, along with that me and my sister also play World of Warcraft, and my little sister is always on facebook. So as you can imagine i have a poor internet connection. So i was wondering, if i were to buy a router and hook it up directly to my XBOX and my XBOX uses that router instead of the one everyone else is on, will it go faster? Also, do i only need to buy a router or would i need to buy other stuff to.