Lamar Odom is speaking up against his own father after Joe Odom called his wife Khloe Kardashian and her family the reason for his drug addiction. The NBA player has denounced Joe in a letter he posted on Twitter, saying the only person to blame for his "dark time" is himself.

Speaking with RadarOnline.com, Joe unleashed a scathing attack against the Kardashians, claiming the reality TV family cursed Lamar and ruined his career when Khloe married him in September 2009.

According to the former post office worker, his 33-year-old son needs to dump his reality TV star wife and start a new life as a single man if he wants to beat his drug addiction.

"Someone's got to speak out. I've got to do something about this. It's simple. They brought him down. He would be better off without them. Let him go and get his life together," he told the Web site.

Lamar is reported to be suffering from drug addiction, which is crippling his marriage to Khloe.

Joe continued, "I blame Kris (Jenner, Khloe's mother) in particular, she's been through a lot of stuff herself. She's no Cinderella. I can't really say if the Kardashians are doing drugs, but my son would never use hard drugs. I can't pinpoint right now who's giving it him, but I'm going to investigate.

"The Kardashians haven't been a good influence on my son."

The elder Odom even called Kris an "evil b****" and said Khloe's sister, Kim Kardashian, is a "porn star."

As for Khloe, Joe, 59, claimed that she isn't as sweet in real life as she is in front of the television.

"I saw her totally differently when I heard the way she talked privately. It isn't pleasant. In public she's nice, but if you see her personally you see the real person come out of her. The mother's like that too. The whole family, they put up an act."

The reality TV family's show, "Keeping Up with the Kardashians" apparently put too much pressure on the former baller, forcing him to turn to drugs.

"They haven't been a good influence on my son. It's been the curse of his life. He hasn't really accomplished anything since he's been with them. Without them, he'd still be in the NBA playing basketball. He'd be playing for the Lakers and be one of the top players in the league."

But according to Lamar, if there's someone who caused his downfall, it's Joe.

Lamar has posted an angry letter on Twitter, blasting Joe for speaking negatively about the Kardashians, whom he called the only family he has ever known.

"Won't continue 2 speak on this but I have got 2 let this out real quick. I have let this man and many others get away with a lot of sh*t. He wasn't there 2 raise me. He was absent ALL of my life due to his own demons. My mother and grandmother raised me. Queens raised me. For the first time since they left, came a blessing of a FAMILY that I married into. FAMILY," he wrote.

"That man wasn't even invited to my wedding. He has never met my mother in law and some of my other family. How can a man who has NOT once called me to check on my well being have the nerve to talk so recklessly about his own 'son.'

He is my downfall! His own demons may be the ONLY thing he gave 2 me. He disrespecting the ONLY FAMILY that has loved me without expecting anything in return. They are the ONLY ones that have been here consistently 4 me during this dark time. Only person 2 blame is myself. Say what you want about me but leave the ones who have done nothing but protect and love me out of this! This goes to out to everyone!"

Khloe is reportedly taking a time off from Lamar after his alleged drug problems got out of control and had become public. It's unclear if she will file for divorce.