It’s a disgusting betrayal by reality television’s worst mom EVER!

In a blockbuster exclusive, the uncle of Alana “Honey Boo Boo” Thompson has told The National ENQUIRER that he eyewitnessed Alana in a bed with her mother, Mama June, and the man who was convicted of sexually molesting another of June’s daughters.

The 9-year-old cutie’s uncle blasted Alana’s mother, Mama June Shannon, for exposing her daughter to evil ex-con Mark McDaniel in a queen-size bed – a sickening incident that is the untold story behind the swift cancellation of the family’s hit TV show “Here Comes Honey Boo Boo.”

“I’m disgusted with June for not protecting Alana from Mark!” Marvin Lee “Uncle Poodle” Thompson told The ENQUIRER. “This guy can’t be trusted. He needs to be locked up and have the key thrown away.”

McDaniel, 53, was released from prison in March after spending 10 years behind bars for molesting June’s then 8-year-old daughter Anna.

Despite his fiendish past, McDaniel traveled with June, Alana, Uncle Poodle and his fiancé to a casino in Cherokee, N.C., on Sept. 12 for a weekend of gambling and sightseeing, according to Uncle Poodle, who, along with his fiancé.

All five stayed in the same hotel room with two queen-size beds. Uncle Poodle and his partner took one bed, while June and Mark slept in the other, and Alana bunked on the floor.

“But when I woke up in the morning, Alana was fast asleep crammed in bed with June and Mark!” Uncle Poodle claimed. “It looked like they were cuddling!”

For the full story and to see the bombshell exclusive photos – pick up the new ENQUIRER on sale now!