Sibling Thing on 'Relative Madness'

Ashley and Mary-Kate Olsen have been acting since they were nine months old, both cast in the role of Michelle Tanner on the popular television series “Full House” in 1987. Although they look alike they are fraternal, not identical, twins. Now adults, the Olsens have grown their media empire and have expanded into the fashion industry as well. In 2007, Forbes magazine estimated their net worth at $100 million.

Watch SOAPnet's Relative Madness -- It's a Sibling Thing countdown this Thursday night to see if Ashley and Mary-Kate top the list!