Thanks for feedback. You are correct-I just started season 4 with Lithgow,* not 3. I’ll probably quit after watching season 4 or 5.I just looked up the show's episode guide to refresh my memory, and John Lithgow is Season 4. I started tapering off in Season 5, though some of the Season 6 episode descriptions sounded familiar. I don't think I got to Seasons 7 or 8. I was really into that show at the time it was first-run, but I don't miss it, and I haven't felt compelled to watch the continuation series or the current prequel series.
* Did you know Lithgow graduated Harvard magna cum laude? And won a Fulbright scholarship to London Academy of Music and Dramatic Art? And that he won a Tony for his Broadway debut in The Changing Room. Impressive fellow!