Cloud/Remote gaming using 2 profiles on same xbox.

Couldn't find an answer by googling.

My 6 year old car mad son wants to play Forza horizon 4 with me on Xbox so we are both in the same game driving around.

At the moment we are not at home but staying at the in-laws so have been playing through the cloud or remotely. There is only one Tv here so having him physically on the Xbox would be impractical.

We have 2 profiles setup on his Xbox at home. "Dad" and "son". His "son" profile has all of his progress within horizon saved whereas the default login profile "dad" has a bit of progress but not much.

I couldn't figure out how to login to the son profile on cloud gaming as by default it is on "dad". Have no idea whether I can change this.

The game is installed on his Xbox at home so as a workround I have remote setup the Xbox so he can login change profile to "son" so he has all his cars.

Is it possible for me to login to the cloud using the "dad" profile while he remote plays on the Xbox using the "son" profile so we can drive together in the game or would I need to buy another game pass account?

Hopefully if it's not possible I can head off the tears rather than muck around for ages trying to get it working while he sits there knuckes white.

Cheers.

:)