Mary-Kate and Ashley Olsen were born on June 13, 1986 to David and Jarenett Olsen. They are fraternal twins. They have an older brother named Trent and a younger sister named Lizzie. Their parents have since separated and their dad remarried. They have a step-brother Jake and a step-sister Taylor. Their step- mom is Mackenzie. When David got remarried Ashley did not attend the wedding. When they were 9 months old their mother took them to try out for the part of Michelle Tanner for "Full House". Sure enough they got the part. They played on the show till they were 9 years old. The show went off the air and people thought this was the end of their career. They had other idea. Mary Kate and Ashley got together with their lawyer/manager and formed a company called Dualstar. Since then they have made 13 movies, put out 169 books, and have 5 TV shows. They are hoping to make many more movies in their time. They have just turned 16 and their presents were Range Rovers - Ashley's is black and Mary Kate's green.

- From IMDB.com