I wondered why there were no windows in the upstairs bedrooms, but it turns out that there were windows.

Actually, there was a tiny window in Alex's bedroom. And I thought there were windows in the other bedrooms too, but maybe not. I haven't watched it in a long time so I am not sure.

Wasnt somebody's room downstairs near the kitchen? Or am I thinking about another show...All the 80s NBC shows seem to run together in my head.

Maybe the bedrooms have skylights? :)

I thought there was a window in Jennifers room, because didnt she have a window seat. IDK Maybe Im thinking of something else.

Alex's room definitely had a window. In the Speed Trap episode, Steven even opened it, and noticed that Alex had dug trenches in the backyard. I also know for a fact that Elyse, and Steven had a window, and I'm pretty sure Jennifer did as well. I'm not sure about Mallory though. They usually seemed to only show her room from one angle. I'll have to watch a few eps. to know whether she had a window or not.