> Few people would have had their own TVs in their room 30 years ago. That wasn't common. They were huge, expensive, and not remotely interesting enough to capture the attention of most people for prolonged periods. It was common to have family rituals where there was about 2-3 hours of watching TV during/after dinner together. That was when they aired a movie after some news.

Depends on where one is from. In my country (U.S.A.), even many lower-middle-class kids tended to have at least a small portable TV (or, more often, the former family TV that had been replaced by a newer one in the living room) in at least their end of the house or apartment, if not their own room, ’way back in the late 1960s to early 1970s. What was common for kids in other countries at that time is, of course, a different matter. As for watching the TV together as a family rather than on separate TV sets: that often depended more on whether the family TV was a newer color model and the kids' room TV was an older black-and-white model --- or, as kids grew older and their viewing preferences changed from their parents’, which shows were on opposite one another. Sometimes it even came down to which room made it easier to watch TV while you were doing homework, talking to a friend who was visiting you from down the street, etc.