I can’t answer the question on the multiple hubs, but the usual way community members solve the problem you are describing is by using one of the third-party dashboards, either action tiles or sharp tools. These allow you to custom select the devices that will appear on any one dashboard.
You can create custom dashboards with these so that, for example, one kid’s room only has the lights for that kid’s room. Their dashboard just doesn’t give them access to the lights in the other kids’ room or in your room.
Some people even get an inexpensive Wi-Fi no contract phone for these.
Or you can use an inexpensive android tablet.
Here’s a recent discussion thread. The topic title is a clickable link.
(one note: One of the major contributors to that thread, @tgauchat , sadly passed away late last year. If you have any questions about action tiles after looking at that thread, you can ask @625alex instead.)
