Is there a way to share games within a family?

The best way would be to use the "Home Xbox" setting.

Set the account that owns all of the games as the "Home Xbox" and the restart the console and everything that can be downloaded from that account should then be visible to every other account on the console, and useable since now the account would then be
tied to the console itself.

You can learn more about this future here.

https://support.xbox.com/en-US/games/game-setup/my-home-xbox

Hi
AttachedNose8,

Thank you for bringing this question to the Xbox Forum.There are two ways you can do this one is if you are both on the same xbox he can share every game on there regardless. The second way is if he has a seperate xbox you set his to Home Xbox in settings
and he has access to all your games.

The main thing though is Fortnite is a free game to Download so therefore you should just be able to download it to his account.

Hi it's really easy as stated above.

If it's one xbox just set it as your home xbox and then anyone using it with their account gets access to all your games.

If you have 2 boxes then set theirs as your home xbox and your one as theirs so you both access to all games.

It also allows you to share gold this way to allow you both to be online

It should also be noted that using game share in this way isn't allowed.

The game share feature is intended for family members within the same household, and sharing login details is against the terms and conditions of Xbox live.

Home Xbox is designed to allow you to share within your family home. There is no other way to share Xbox Live Gold or any other content, without using the Home Xbox feature.