The cast of "The Big Bang Theory" has had their fair share of ups and downs in their personal lives. Johnny Galecki, who plays the lead character, has a son named Avery with his ex-girlfriend Alaina Meyer. Though they have separated, they co-parent their son and remain on good terms. Jim Parsons, who portrays Sheldon Cooper, has been in a long-term relationship with Todd Spiewak since 2002. They got married in 2017 but do not have children together. Kaley Cuoco, who plays Penny, split from Johnny Galecki during filming season three and is now in a relationship with actor Tom Pelphrey. They welcomed their daughter, Matilda, in March. Kunal Nayyar, who portrays Raj, is married to Neha Kapur but does not have children. Simon Helberg, who plays Howard, is married to Jocelyn Towne, and they have two children named Adeline and Wilmer. Former child actress Mayim Bialik shares two sons with her ex-husband Michael Stone.