Josh Wolowitz is Howard Wolowitz's half brother. In "The Fortification Implementation", Howard meets Josh, his father's son from a second family, for the first time. Josh is an oceanography student from San Diego who learned about Howard after his mother's lawyers contacted him. He has a similar warped personality as Howard had before he met Bernadette. He understands about the robot arm that Howard used for self-gratification. Howard hugs him knowing that he is really his brother. Josh also thinks it's neat that his half-brother is an astronaut.