Jack Donaghy had several siblings in season one of 30 Rock (one of them played by Nathan Lane, no less) but this was pretty quickly retconned. This was maybe the most significant retool of the show as a whole because it allowed them to establish and solidify the dynamic between Jack and Colleen.
stopmakingsents t1_jdlaou7 wrote
Reply to Man convicted of murder based on the victims pet parrot's testimony by yjee
Bird law, etc