Joey Rostenkowski is the son of Mike Rostenkowski and Mrs. Rostenkowski, and the younger brother of Bernadette Rostenkowski-Wolowitz. Bernadette used to have trouble getting him to stop spitting in their siblings' mouths.
- Father: Mike Rostenkowski
- Mother: Mrs. Rostenkowski
- Sister: Bernadette Rostenkowski-Wolowitz
- Siblings: Four Other Unnamed Siblings
- Possible Children or Nephews/Nieces
- Brother-in-law: Howard Wolowitz
- Nephew or Niece: Baby Wolowitz