Hi
I'm sorry, I am not sure of your current connected speed, but from what I can gather, it's circa 60mbps, so I find it hard to believe with game machines and video streaming, even if you had IP phones, you have exhausted your bandwidth, unless your family is exceptionally large (ie excess of 10 users or or 10 computers/game consoles), given that most work on 2mb each, but let's say it's 4mb, x 10 would give you 40mbps, with leeway spate of 20mb...
I could be wrong though as a lot of information is not given and you maybe on less bandwidth
However, if your doing this primary for games console, to improve gamers experience, then the latency is adapted at the games server, to try to equalise the connected users latency, and it's normal for anything with latency of less then 50ms, to give excellent user experience (I know, I have been an avid gamer for years, playing against a lot of friends from all over the world), some with latency in excess of 350ms, but no real ghosting or sudden loss/seen of user. However, there are a few tricks used by cheaters, to give them an advantage in play, but if caught using these, a full ban on the game follows - light switch is one cheat
Many thanks
Johb