can i play xbox one kinect games on a xbox one s?

A Kinect is an accessory for an Xbox 360 and an Xbox One, not a console itself. If it's an Xbox One game, it can be played on an Xbox One or Xbox One S. If he has an Xbox 360, it will not work.

Hi, yes the game requires a kinect on the Xbox One, Xbox One S Or Xbox One X to play.

For example, my cousin plays on the Xbox one s and my brother plays on the original Xbox one. Will I be able to play online with them?

Yes, absolutely. You can also play BC 360 games with users who are still playing on Xbox 360.

All Xbox One games (but not kinect games) will work on on Xbox Series X/S and you can play these games with others even if they haven't yet bought the latest console.

Hey there chinchilla444,

To answer your questions.

Q: Will our current Kinect box work with the new Xbox One S or the Xbox 1?

A: The Xbox 360 Kinect is not compatible with the Xbox One, which has a new Kinect Sensor. So you would need to purchase a new Kinect for Xbox One if you're interesting in playing Kinect enabled games on Xbox One.

Q: Are the Xbox One and Xbox One S compatible together online?

A: Yes, they're fully compatible with each other. The main differences between the two is that the Xbox One S has a built in 4K UHD Blu-ray player and can output 4K resolution to your TV (if it's compatible). The original Xbox One console is unable to display 4K
resolution or support 4K UHD Blu-rays. It can support normal Blu-rays and 3D Blu-rays though! Aside from that, they both play the exact same games

I hope this answered your questions. Please let us know if you have any others!

You failed to include this little tidbit from that link -

If you plan to use a Kinect sensor with Xbox One X or Xbox One S, you'll need a Kinect Adapter. For details, see
How to use an Xbox One Kinect Sensor with Xbox One X or Xbox One S.

Or you can look at this -

Compatible with everything Xbox One

https://www.xbox.com/en-US/xbox-one-x?xr=shellnav

Xbox One accessories work with Xbox One X

The Xbox One accessories you’ve got now (or have got your eye on) work with Xbox One X *2

No hassle. Just play.

*2 - Excludes the Xbox One S stand that works exclusively with the Xbox One S.

Xbox Kinect Adapter (sold separately) required for Kinect on Xbox One S and Xbox One X.

I'm not finding where they lied here regarding the compatibility.

You can voice your feature request here -
https://xbox.uservoice.com