Randall

This unnamed man is Penny's brother. Apart from Penny, he has another sister whose name is unknown and is the only son of Wyatt and his wife. He hasn't appeared in the show, but was mentioned in The Pirate Solution where it was revealed that he works in a meth lab and is described as a 'kind of chemist' and he and Leonard and in The Rhinitis Revelation where Penny asks God to make her brother stop using methamphetamines, but without involving the police when Sheldon's mother decides to get them to pray at a Roman Catholic church.