As @TassyWass has said give them the YT link, if they have a 4k TV chances are it’s a smart TV and has the YT app. Watching it in 4K depends on their internet connection, I can’t watch in 4K on my TV because the streaming constantly buffers but it’s ok at 2.7k.
I can put a 4k on a USB stick and it plays without a problem.
Give them the link then it’s down to them how they watch it.
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