Washington, December 25 : While Lindsay Lohan alleged that her father had cheated on her mother, dad Michael has denied the claim.

Writing on her MySpace blog, in a post titled "Random Thoughts," the singer revealed her troubled state of mind, adding she has a half-sibling.

She wrote: "I have gone through a lot in my past, and to be completely honest, I am still going through a lot right now.

"My father just let my family and I know, amongst others that he had another child after my little sister Aliana, or maybe he had it before Aliana??

She continued: "Either way, he cheated on my mother and that really sucks."

However, in an e-mail to People magazine, Michael has denied the allegations, saying in a separate conversation that he believed there was a "99 percent chance" Lindsay's message had been authored by her girl lover, Samantha Ronson. (ANI)