From Shack: Jerry and Dick Van Dyke
From Bobistheowl: Sliders, Jerry O'Connell and his brother in real life, (Charlie?), who played his brother from a different time steam.
Dean Winters and his brother, (Scott?), played brothers Ryan and Cyril O'Reilly on Oz
Andrew Terraciano and his brother Tony are detective Danny Reagan's sons Sean and Jack on Blue Bloods.
So there is at least one more answer to go, hint: The set of Bro's I was thinking of is from a classic sitcom
On My Three Sons, Chip and Ernie were portrayed by real life brothers Stanley Livingston his brother whose name escapes me at this time.