Tatum O'Neal by Amy Sussman/Getty Images for IMG
Tatum O'Neal expressed concern for her father and half-brother, Ryan and Redmond O'Neal, after the two were arrested Wednesday on suspicion of drug possession.

"I'm really worried about Redmond," the actress told People. "I want them both to get better and get the help they need - especially my brother."

"[Addiction] runs in families. It's a disease," Tatum continued. "I'm praying for both of them. I'm praying for my whole family. I hope Red will get treatment. That's what he needs. There is hope for Redmond."

The O'Neal men were arrested after authorities made routine sweeps through the house to enforce Redmond's parole. They were later released on $10,000 bail each. Redmond, 23, had pleaded guilty to drug possession and one misdemeanor DUI charge in June, which came after a 2004 rehab stint for heroin addiction.

Tatum was herself arrested in June for allegedly attempting to purchase cocaine. In July, the actress pleaded guilty to a charge of disorderly conduct. - Anna Dimond

Related:
" Ryan O'Neal and Son Arrested on Suspicion of Drug Possession
" O'Neal Pleads Guilty to Disorderly Conduct Charges
" Tatum O'Neal Busted for Coke