Lohan dad in threat to Ronson

Lindsay Lohan's dad Michael has threatened to release a plethora of evidence in a bid to prove Samantha Ronson is a bad influence on his famous daughter.

The 'Mean Girls' star took to her MySpace blog earlier this week to share her shock at finding out Michael had allegedly fathered a lovechild during his marriage to her mother.

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 that he had another child after my little sister Aliana, or maybe he had it before Aliana?? Either way, he cheated on my mother and

that really sucks."

But the elder Lohan is convinced the post was actually written by his daughter's girlfriend Ronson - and he is now blaming the DJ for the actress' stalled Hollywood career.

Michael told TMZ.com: "What real work has Lindsay done since Sam? Maybe she should follow Britney (Spears) or Drew (Barrymore)'s paths and get rid of the darkness and come into the light."

The star's enraged father has even warned Ronson he will spark a media war if another inflammatory post is made about him on his daughter's webpage.

He added: "If one more blog or statement is made people will know the entire truth. I will release e-mails, texts, depositions and audio tapes that will prove everything I have been saying all along. If Sam wants to play, I am ready. But she better be ready too!"