David "Dave" Olsen is Mary-Kate and Ashley Olsen's father. He was born in 1953, which makes him 50 years old. He is a mortgage banker and commercial real estate investor, and he plays golf. He divorced Mary-Kate and Ashley's mother in 1996 and married McKenzie Taylor on March 10, 1996. He and McKenzie were engaged for a year, which he and Jarnie were still married.
Jarnette "Jarnie" Olsen-Fuller is Mary-Kate and Ashley's mother. She was born in 1954 and is currently 49 years old. She used to be a ballet dancer, but is now a homemaker. Jarnie's maiden name is Fuller, which is where Ashley got her middle name. Jarnie can be seen in the audience several times during a video in Mary-Kate and Ashley's Our First Video.
Trent Olsen is Mary-Kate and Ashley's older brother. He was born May 6, 1984 and is currently 19 years old. He has light brown hair and blue eyes. Trent gets along well with both twins, but is closer to Mary-Kate. His favorite color is green. Trent has appears in The Case of the U.S. Space Camp Mission and You're Invited to Mary-Kate and Ashley's Sleepover Party.
Elizabeth "Lizzie" Olsen is Mary-Kate and Ashley's younger sister. She was born on February 16, 1989 and she is 14 years old. Lizzie has strawberry-blonde hair and blue eyes. She gets along well with both Mary-Kate and Ashley, but she sometimes argues with Trent. Her favorite color is yellow. Lizzie has appeared in How the West Was Fun, The Case of Thorn Mansion, The Case of the Funhouse Mystery, and The Case of the U.S. Space Camp Mission.
Martha "McKenzie" Taylor is Mary-Kate and Ashley's stepmother. She is 44 years old. McKenzie and Dave were married on March 10, 1996. McKenzie is the mother of Taylor and Jake, Mary-Kate and Ashley's half-siblings.
Taylor Olsen is Mary-Kate and Ashley's younger half-sister. She was born in 1996 and is currently 7 years old. Taylor has blonde hair and blue eyes. Most likely, she was named after her mother's maiden name.
Jake Olsen is Mary-Kate and Ashley's younger half-brother. He was born in 1997 and is 6 years old currently. He has blue eyes and blonde hair. Jake went to Australia with Mary-Kate and Ashley when they filmed Our Lips Are Sealed.