I'll tke #1. Fielding Chase and his daughter; Leslie Williams and Margarrat Williams, and the mother/daughter team of 'it's all in the game.' Can't think of the both names right now, but I know the daughter's name was Lisa. I liked this episode, withut a confession, Columbo would have been sunk.
There were also other episodes with family members in them like Double Shock, Swan Song, etc. The list goes on.
Good job everyone! For #1 I was looking for actors who are parent/child in real life. Laura got Bruce & Bruno Kirby and Welshdragon got Janet Leigh and Jamie Lee Curtis. Those were the 2 I was thinkng of. BTW, I didn't realize Katie Sagal was in a Columbo? Franco got #2 & #3 correct, and quid_quo_pro was right on #4.
This was a terrific quiz. I never made the connection with Batman, et al. Great questions!
Katey Sagal was the secretary in "Candidate for Crime"--the one who tells the guy delivering Hayward's new suit that she will take it because he is in a meeting. It is hard to recognize her without her Peg Bundy hairdo.