Eric Roberts says his addiction battle led to him losing his daughter Emma Roberts

Eric Roberts says his addiction battle led to him losing his daughter Emma Roberts.

The 68-year-old actor - who has been open about his past struggles with drug use - split with his ex Kelly Cunningham when Emma, now 33, was just a baby, and he lost the custody battle at the time.

In his new memoir 'Runaway Train: Or the Story of My Life So Far', he wrote: "Of course, the biggest consequence of my drug use was losing Emma.”

He also acknowledged the impact his addiction had on his relationships with his sisters Julia and Lisa Roberts.

HHe added: "I wouldn’t be surprised if they suffered from PTSD from when it was dangerous to be around me.

“Lisa and Julia needed love and protection — instead they got fear and uncertainty.”

At the time of his breakup from Kelly, his estranged sister Julia Roberts took his ex's side in the legal case because of his addiction issues.

While he doesn't go into detail in the book, he has admitted he now realises it was the rigth decision.

He added: "I imagine I will remain as Julia’s brother and Emma Roberts’ dad for the rest of my life.

“I’d like to make good on that, to move aside proudly and with grace. That’s part of the reason for writing the book.”