Brian Bonsall
Brian Eric Bonsall is an American former child actor. He played Andrew Andy Keaton, the youngest child on the NBC sitcom Family Ties from 1986 until 1989, and Alexander Rozhenko, the son of Worf and Kehleyr, on Star Trek The Next Generation from 1992 to 1994.
Bonsall was born in Torrance, California. At the age of five, he won the role of Andy Keaton on the sitcom Family Ties. Bonsall won three Young Artist Awards for his performance on the series. He was also nominated for a Young Artist Award for his starring role in the madeforTV movie Do You Know the Muffin Man in 1990.
Source: Wikipedia