I assume he wouldn't care if TVs in other homes stay logged in when he's not there. As long as they work when he visits, wouldn't that be enough? It could be annoying if another family member goes there for a week and it won't log in because the primary device isn't present.

I guess I misunderstood then. So you mean you activate the network with your primary phone and then it stays active for some time. That would actually work for me.