Lindsay Lohan has a secret half sister Lohan Fri-16-Nov-12 09:27 Share this Lindsay Lohan has a secret half sister! For the last four years Kristi Horn has tried to convince Michael Lohan that he is the father of her 17-year-old daughter Ashley, and he agreed to settle the matter by taking a DNA test on U.S. daytime TV's The Trisha Goddard Show.The results came in and ….. Michael was busted. He IS the girls father.the girl looked a bit pissed off and when Michael tried to hug her, she said, "This is the first time I've met you. I'm sorry, but I'm not sure..." You May Also Like Oprah tells Lindsay Lohan off Lindsay: 'My computer's stolen!' Lindsay Lohan is planning a music comeback Become a fan of The Edge on Facebook and on Twitter .