Yup, I distinctly remember "E/R" being paired up with "Day by Day", which also featured a teenage son played by an actor who I seem to recall was in a bunch of stuff before disappearing completely.
Ooh, freakish trivia that I can actually answer!
His name was Chris Barnes (aka C.B. Barnes), and he was also on a TV series version of Starman (originally from the Jeff Bridges film), where the "starman" was played by Airplane's Robert Hayes. In the film -- spoiler alert -- the starman has a relationship with a human woman and at the end of the film she has his child. The TV series played on that tidbit by making Chris Barnes play that child as the now-teenager.
He also played Greg Brady in the parody Brady Bunch movie, and he's the voice of Prince Eric in The Little Mermaid. Looks like he's still doing a lot of voice work for TV and video games. And in looking at his credits on imdb, it seems that he guested for a few episodes on 90210, Sarah! So you may be revisiting his work eventually.
I admit, I had a little crush on him back in the day, when he was on Starman and Day by Day. But I lost track of him. Shame on me. I'm a bad fan.
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