Using Multiple remote controls on my AppleTV

you can only use 1 siri remote with the appletv

but you can use many of the old non siri remotes at once

Amazon.com: New Replacement Apple tv Remote Control for Apple TV 1 2 3 4 A1842/A1625/A1469/A1427/A1378/A1218/A1156 (Made from Plastic not Original) : Electronics

Additionally, one of you may choose to use the software remote on iPhone. There is no limit to that either.

Set up the Apple TV Remote on your iPhone or iPad - Apple Support