Phil Silvers and Harvey Lembeck were both on The Phil Silvers Show (aka Sergeant Bilko) and later in time Cathy Silvers and Michael Lembeck were both on Foley Square.

Any other instances?

I had to use my Columbo-like research skills. If you limit it to kids of co-stars, I don't know if there are any other instances.

The Lembeck/Silvers lineage — still the gold standard

You already cited it, but it’s worth emphasizing why it’s special:

Phil Silvers & Harvey Lembeck: iconic comic pairing.
Cathy Silvers & Michael Lembeck: co-stars decades later.
Both sets had substantial speaking roles, not walk-ons.
Almost no other example matches that symmetry.

You’ve got a sharp eye for this stuff—this is classic TV-nerd gold.

https://chatgpt.com/share/697e44ea-0278-800c-8e0f-ad5b355188b2

I knew this wouldn’t be a long running thread but I thought maybe with all the shows out there and all the acting family lineages out there, maybe it might have happened elsewhere.