No, but here goes:
Nick and Fred Yakich (both wingers, Nick toured NZ with the Australian team in 1965).
Greg and Stuart Davis (both wingers again, I don't think Greg ever made it to 1st grade, but they played on the reserve grade wings together, circa 1980).
Michael and Phil Blake.
Glenn and Brett Stewart.
Liam and Kieran Foran.
Greg and Peter Cross (Greg was Krilich's understudy around the late 70s. Peter, a prop from memory, played with Norths in 1st grade, but I'm sure he started out in the Manly lower grades).
Wayne and Tony Springall (Tony a hooker from memory, went to Norths too).
John Harvey also had a brother in the lower grades but his name escapes me.
Chad Randall had a brother who didn't progress past the junior rep sides.
George and Trent Rose.
No doubt there were others.