While her husband Javi was away from home during this season of "Teen Mom 2," Kailyn appreciated her mom Suzi's help with son Lincoln. But in the sneak peek from Part 2 of the "Teen Mom 2" reunion below, Javi learns some troubling news about his mother-in-law: Suzi hit the bottle while caring for the youngster.

"I'm pretty mad about Lincoln going [there] while she was drunk," says Javi, who had just learned of the incident backstage. He then tells host Dr. Drew that he has reason to be extra-angry: He'd once warned Kail about having Suzi look after their son.

"I told her, 'This is why I don't want Lincoln going over there without you there,'" Javi explains. "She fought with me and she said, 'Oh, you don't know my mom. I grew up with her.' I was like, 'You don't even know your mom...I don't want Lincoln going over there by himself. I don't want you leaving him there.' And sure enough, I was right."

But an emotional Kailyn reminds her husband that their conversation came after the incident with Suzi. Regardless, Javi is still displeased.

"Well, it would have been a good time to tell me that instead of finding out today," the young father says. "I'm so furious."

How does Kailyn feel about the troubling ordeal? Watch the video to hear her side of the story -- and the entire conversation -- and be sure to tune in to Part 2 of the "Teen Mom 2" reunion on Wednesday at 10/9c.