"They were definitely talking smack about Kody and the other wives," the source spilled. "They were having a deep and animated conversation that lasted over three hours."
"At one point, Janelle left because it was getting late, but the three of them gossiped until 11 p.m.," they added, noting that Christine "seemed very heated while talking about Kody. She mentioned he was stressing her out."
The source also noted that since Janelle and Kody's 27-year-old daughter, Maddie, was at the table with them, Christine was referring to the Brown family patriarch as "Dad" the whole time.
- 'Sister Wives' Fans Go Wild After Christine Brown Reveals She Won't Be Friends With Robyn: 'Living Her Best Life!'
- 'Sister Wives' Star Janelle Brown Considers Moving to Utah After Kody Snubs Daughter Savanah
- Sister Wives' Janelle Fires Back at Kody After Split, Claims She and Christine Don't 'Deserve Less' Than Other Wives
Never miss a story — sign up for the OK! newsletter to stay up-to-date on the best of what OK! has to offer. It’s gossip too good to wait for!
The witness further clarified that David mentioned meeting at least one of the other sister wives "twice", pointing out that the woman in question — either Robyn or Meri — allegedly kept giving him "weird looks."
As for Maddie, she was reportedly overheard saying Kody had "cut them off" and that their hit TLC show had become "volatile" lately.
This comes after OK! reported that the father-of-18 hasn't been happy about his 12-year-old daughter, Truely, living with Christine and David before the lovebirds officially tie the knot.
"It has been brought up several times by Kody that he doesn't think it's appropriate for his daughter to be living in an unwed household," a source dished back in May. "There have been conversations about how he's uncomfortable with the fact alone that Christine and her fiancé are living together and not married."
The eyewitness spoke with The Sun about Christine and Janelle's conversations.