A fresh Steam Beta Client has been released for Desktop and Steam Deck, with a few fixes and upgrades and the change for Steam Families is especially nice.
Steam families freaking rocks, the original library sharing was a pain for my kids. I'm so glad they are doing this. On my next trip to the US I want to buy a deck for my kids but I don't know how, since it requires a US based account.
Yeah, I really like the fact that my son and I can play different games from the same library at the same time. Also, the bi-directional sharing is very nice, and the whole thing is much easier to set up than the original library sharing.
It does have to be in the same country. I don't think it has to be the same wifi network, although Valve does say that it's intended for people in a single household so they might change requirements later.