Enough with one Xbox live gold in family? Two consoles

It sounds like he has that console set as his Home console. If he has the console you're using set as his Home console, then you'll be able to share his Gold and any games his purchased. https://beta.support.xbox.com/help/hardware-network/console/my-home-xbox

No it’s me that have it as main console.

About sharing games i dont understand it, i bought a game on his account with my credit card. When he asked me to try it in livingroom i could login myself on my home console and download his new game.

But when i tried to login myself on his console to download a game from my account it didnt worked to start it.

So if i buy games on his profile on his console, i get it too on my console, find it strange

It sounds like he has that console set as his Home console. If he has the console you're using set as his Home console, then you'll be able to share his Gold and any games his purchased. https://beta.support.xbox.com/help/hardware-network/console/my-home-xbox

You may have it as your Home console, but it sounds like he has it has his Home console too. That's also why you're downloading games on that console when they are purchased on his account.

Or to make it easier:

When you add a family member to an Xbox LIVE Gold Family Pack, you have to add it to the same console as the primary account holder. However, after you add that family member to your Xbox LIVE Gold Family Pack, they can recover their account on a different
console and still remain a part of the Family Pack. AND The Xbox LIVE Gold Family Pack gives you four 12-month Gold memberships for less than the price of two.

Hi!

It's possible to
share the same Gold subscription on two consoles in the family. That way you don't have to buy a new subscription.