Jenelle Evans and Nathan Griffith will be seen at war during the upcoming Teen Mom 2 season seven reunion.

During the show, Griffith is seen complaining about Evans' refusal to allow him to spend time with their one-year-old son Kaiser.

“If I give you pictures it still won’t be good enough so how about I meet up with David [Eason] and I’ll buy stuff in front of you,” Griffith said of a past conversation with his ex-fiancee, according to a report by Radar Online on Friday. “I will do anything you want.”

“He has no highchair, he has no sippy cups, he has no food for him, he does not have anything. He has a one-bedroom apartment. He doesn’t even have a room for Kaiser,” Evans shot back.

But Griffith wasn't backing down and quickly took aim at Evans and her boyfriend's alleged drug use.

“It is funny that my son is in an unstable environment with two drug addicts,” he alleged of Evans and David Eason. “You see weed in the background… smoking constantly. And now you have all these mystery ‘illnesses’ with all of these drug abuse problems.”

Rather than address the issue, Radar Online claimed Evans instead changed the subject by asking why Griffith’s lawyer claimed their sex was painful in a complaint.

When Griffith told Evans she shouldn't be talking about the sex life on television, Evans replied, “I’m sorry if it bothers you that I talk about my sex life, sorry I’m not with you anymore.”

“I don’t want you to be with me! How many pounds have you gained? 30, 40 pounds?” Griffith then asked.

On Twitter, Evans recently addressed her weight gain, telling fans, “Like I said… Yeah I’ve gained weight but that’s because I’m happy and healthy in life… is he? Probably not.”

Evans also took aim at Griffith's new hair on Twittter, poking fun at his man bun with a meme.

In response, “Awww thanks for noticing me (Again. And again. And again. And again)! Jokes on you and always will be!”

For more of Jenelle Evans and Nathan Griffith, tune into the Teen Mom 2 season seven reunion on Monday at 10 p.m. on MTV.