one xbox account ooon two machines?

You can't sign into the same account at the same time on two consoles. So if they will be playing at the same time, one of them will need a new account.

use home gold console sharing...

why not make his console your home console... he gets access to all your games, apps and gold subscription benefits... meaning he does not need a gold account saving you some money... also any game you buy is available to that console and yourself.. meaning
you only need to purchase a game ONCE..

when you purchase a game.. you get 2 licenses... one tied to your home gold.. one ties to your account...

Thank you, Would you have any links to support that?

I was told I could only game on his Xbox using MY Account for a limited time..

You are saying that is Not True.. if so great

Again thanks..

What Doc said.

Sure you can use the Home Gold but you can only use it on one console at a time. Also, if they want to go on Xbox 360 (which is highly popular), you'll need your own Gold account to play multiplayer games and join XBL Parties on Xbox 360. You can't join
or create an Xbox Live Party on 360 without holding a Gold account. And everyone gets special monthly Games with Gold deals when you have a Gold account. Gold is better. And it's easier to socialize with Gold too. And 12M Gold membership is affordable for
yourself. In NZ rrp for 12M Gold is only NZ$79.95 though some authorized retailers offer it for NZ$48 when they have sales - I benefit a lot from the retailers. If you get Gold for yourself it isn't expensive and well worth the money. Get it once and you won't
have to worry about it for a whopping long 12 months. Having Gold is like being a VIP member on XBL in contrast to just having a Free Account on XBL (or what some on here still call Silver even though it's officially called Free Account now.

It should be noted that the 2 for 1 game concept that Tohellnbak is talking about refers exclusively to digital purchases only.