<P> Growing Pains is an American television sitcom that aired on ABC from September 24, 1985, to April 25, 1992 . The show ran for seven seasons, consisting of 166 episodes . </P> <P> The Seaver family resides at 15 Robin Hood Lane in Huntington, Long Island, New York . </P> <P> Dr. Jason Seaver (portrayed by Alan Thicke), a psychiatrist, works from home because his wife, Maggie (Joanna Kerns), has gone back to work as a reporter . Jason has to take care of the kids: ladies' man Mike (Kirk Cameron), bookish honors student Carol (Tracey Gold), and rambunctious Ben (Jeremy Miller). A fourth child, Chrissy Seaver (twins Kelsey and Kirsten Dohring; Ashley Johnson), is born in October 1988 . In the middle of season four (1988--89), she was first played in her infant stage by an uncredited set of twin sisters . Then, by season five (1989--90), she was played in her toddler stage by alternating twins Kristen and Kelsey Dohering . In seasons six and seven (1990--92), Chrissy's age was advanced to six years old . By the seventh and final season, homeless teen Luke Brower (Leonardo DiCaprio) is brought into the Seaver family to live with them until nearly the end of season seven . </P> <Ul> <Li> Alan Thicke as Dr. Jason Roland Seaver </Li> <Li> Joanna Kerns as Margaret Katherine "Maggie" (née Malone) Seaver </Li> <Li> Kirk Cameron as Michael Aaron "Mike" Seaver </Li> <Li> Tracey Gold as Carol Anne Seaver </Li> <Li> Jeremy Miller as Benjamin Hubert Horatio Humphrey "Ben" Seaver </Li> <Li> Ashley Johnson as Christine Ellen "Chrissy" Seaver (seasons 6--7) <Ul> <Li> Kelsey and Kristen Dohring as Christine Ellen "Chrissy" Seaver (toddler) (season 5, alternating) </Li> </Ul> </Li> <Li> Leonardo DiCaprio as Luke Brower (season 7) </Li> </Ul>

Who played the part of the homeless person who came to live with siblings mike carol ben and chrissy