Jenelle Evans and her mother come to blows during next week's Teen Mom 2 finale.

In a sneak peek at next week's episode of the show, Jenelle and Barbara get into a heated argument after Barbara expresses her frustration in having to constantly transport Jace, 6, to and from Jenelle's house.

“Last weekend I went all the way to your house to pick him up,” Barbara explains to her daughter in a clip shared by Starcasm on Wednesday. “Every weekend I come to pick him up!”

“Then give him back to me,” Jenelle replies. “I want to know: Why am I not allowed to have my son back? Why can I not have custody? Please tell me. I want to know a reason right now!”

“I’ll tell you one reason right now!” Barbara fires back. “This guy is controlling you, and he thinks that he’s gonna take control of Jace? Nuh uh! This is between me and you and Jace, not between David. Get rid of all the crazy boyfriends Jenelle!”

“He’s nothing but a chunk of change to her, is all he is,” David chimes in. “And that’s f**ked up.”

“You [BLEEP] boyfriends — he’s not crazy, you idiot!" Jenelle tells her mother. "He didn’t have me go to court. Before I met David I was bringing you to court. So please tell me why. Please tell me why I can’t have my son! He even asked me, ‘Why haven’t I lived with you yet?’ And I said ‘Because we have to go to something called court –”

“Because you’re brainwashing him again,” Barbara interjects.

“And then he said, ‘How long will it take for me to live with you?'” Jenelle continues. 

“That’s what you guys are putting in his f**king brain,” Barbara explains.

Earlier this week, Evans took to Twitter where she shared an elaborate rant against MTV with fans, claiming the network has portrayed her as a bad parent.

"I’m pretty convinced @MTV constantly wants to make me look like most horrible mother ever. Doesn’t show a damn positive thing for my story and this season and this upcoming ones were suppose to be really nice and smooth towards the end but of course if @MTV hires a director that judges you, hates you, and wants to make you look out to be bad… They will do it. They hold all power in the edit room. You would think they would have shown by now how I’ve been trying to get Jace back for over a year, or how many great times we’ve had. I should start my own show where you guys see no negativity but just positive vibes."

For more Jenelle Evans, tune into Teen Mom 2 season seven on Monday nights at 10 p.m. on MTV and check out a sneak peek at next week's finale episode below.