Corrected entry: In the episodes "The Dumplings Paradox" and "The Pirate Solution" Penny mentions that she has a brother. But in the episode "The Maternal Capacitance", Penny talks to Leonard's mother about how her father had always wanted a boy.
Space_Cowgrrl
8th Jul 2011
Correction: She has a younger brother. Her father treated her like a boy because the male had not been born yet. And apparently, he kept treating her like a boy.
Knever