Editing Growing Pains (section)

=== Later additions ===
* A fourth child, Christine Ellen "Chrissy" Seaver (twins Kelsey and Kirsten Dohring; [[Ashley Johnson]]), is born at the beginning of season 4, a day after Ben's 12th birthday. She was played in her newborn/infant stage by 2 uncredited sets of twin sisters, who remained in the role until season 4 (1988–1989) ended. By season 5 (1989–1990), she was played in her toddler stage by alternating twins Kirsten and Kelsey Dohring. In seasons 6 and 7 (1990–1992), Chrissy's age was advanced to 5 years old.
* A new cast member was added for the seventh and final season (1991–1992) when homeless teen Luke Brower ([[Leonardo DiCaprio]]) is brought into the Seaver family to live with them until the end of season 7.