Ashley Kaufmann is the alleged half-sister of Lindsay and Ali Lohan. Kristi Kaufmann, Ashley's mother, had a brief affair with Michael Lohan in 1995, and she alleges that Ashley is the product of that encounter.New York Post: Lindsay Lohan's Dad Could Have a Secret Love Child (July 1, 2008)

In late June 2008, Michael Lohan agreed to take a paternity test to determine if he was, in fact, Ashley's father. Michael Lohan has said he is "furious" that Kristi Kaufmann went to the media with the story of Ashley's possible parentage and claims he will sue her if the test turns out to be negative.New York Post: Lindsay Lohan's Dad Could Have a Secret Love Child (July 1, 2008)

E! Online reported on July 17, 2008, that the testing facility will not perform Lohan's paternity test without a court order.E! Online: Lohan Paternity Test Delayed (July 17, 2008)