Games pass for family members

I apologize for any frustration this may have caused. The reason why the Ultimate Game Pass cannot be shared with family on PC is because it is designed to be a single-user subscription. However, you can create a family group and add family members to it, and then purchase separate Game Pass subscriptions for each family member. This will allow each family member to have their own Game Pass subscription and access to the games on their own devices. I hope this helps!

However that is limited to perks and seperate PCs

You can sign in with the subscribed accounrlt in the xbox store and download said games but cloud is a subscriber perk only

The friends and family test.plan has been paused for now with a "possible" future release

Home.console.is only a console.feature

You can set the
Home Xbox funtion.

If i understand the problem, you want to buy them both an Xbox Game Pass subscription to play on their respective PC's ? Buy an Xbox Game Pass PC sub for each or a Ultimate Game Pass. Log their account on Xbox beta app on PC and buy them the correct sub.
Or use xbox.com with their account correctly sign in and buy them Xbox Game Pass for PC.

Regarding Game pass on Xbox. If you have a game pass you can set your box as homebox.

Then, any other account can share your subscriptions, games, and apps on that Xbox. You can Buy Ultimate and then one of your sons when logged with your account on The PC can have a game pass. Then you must buy a game pass for PC to another son, but with
his account. If you want both of them to have their own PC game pass, then you must buy a game pass for each account, but with their accounts. Homebox

You need the ultimate game pass, and the Xbox game pass beta app for pc but you can only use one account for them to play which is yours