Do all using services allow this? Is it at least ad easy and straightforward as telling your trustworthy auntie your password?
I'm pretty sure I have my Android phone setup with a passkey for my Google account and also my Windows laptop.
Presuambly the same logic applies for a service that permits multiple passkeys. Each person would register a passkey on their device using the shared credential.
90% of my YouTube use is on my smart TV. There's not really a straightforward way to block ads there. Used to be many years ago that a PiHole or similar would work, but they clued onto that years ago.
It periodically has issues loading videos when Google change something, but the app gets updated every time within a day.