can I play my PC games on Xbox series x?

Okay so just to make sure I understand.....

I make my sons Series S (MY) Home Console.....

He can play Online with me if I am on my PC signed in as me.
I can also sign into my own Series X and play my games.

We wont be playing together on XBOX on both Series S and Series X.

If you want to play PC games then you need to play them on your PC. If your PC isn't good enough then you'll need to buy one that is. You can't play PC games on a Series X.

Both my self assembled PC gaming tower and my Series X are connected to my new LG C2 OLED. I use either my Xbox Series X controller or my 8bitdo Pro+ for most single player PC games. You're not restricted to keyboard and mouse for PC games for the most part.

I play on the Xbox Series X and my game crashes every time i start the expansion. Its not only a PC thing

How can i fix this?

i disagree, the series s is a good few years old tech now, so is the series x. i have a series s for my youngest kid and i can definately say, it is trash compared to the pc's in my home, its slow, games are running at mostly low to probably low-medium. series x is also getting on a bit compared with the tech available these days.

An i can deffo say the PC games i play come in way above the series s and even better fidelity and framerate than series x,

Thank you for your answer.

I wrote the titles, games that i bought have notes - pc, xbox play anywhere, x/series x.

I can buy another titles with notes - pc (only pc).

How can i buy them through console?