Lindsay Lohan's small sibling to take part in heroin fiend in newfangled film: LINDSAY Lohan's little brother, Michael Jr., is eager to follow his big sister into the movie industry and will play a drug addict in an upcoming film directed by his mother, Radar Online reported Wednesday.

"We're working on a movie for him, and I am the executive producer and director, with Michael being the star," his mother, Dina Lohan, told the entertainment news website.

The movie about a group of heroin-addicted college students is in pre-production and filming is expected to begin in March. "He better not win an Academy Award before me!" Lindsay Lohan said about her brother's acting ambition, according to the Lohan matriarch.

This will be the first major role for Michael Jr., 23, whose only acting experience includes playing an extra in Lindsay's 1998 blockbuster hit "The Parent Trap."

The oldest Lohan son graduated from Ithaca College in May 2010 with a degree in Business Administration. His elder sister was unable to attend his graduation festivities because she was in a Los Angeles court for violating the terms of her 2007 DUI probation.

She spent 14 days in jail and a few weeks in rehab in the summer for the offense. The 24-year-old actress then returned to rehab in October for three months when she tested positive for cocaine while still on probation.