Reba McEntire, the season's newest mentor, joined "The Voice" lately.She is also Kelly Clarkson's ex-mother-in-law, and her appearance on the show appears to be bad news for the award-winning former "American Idol" contestant.

Reba, according to Radar Online, wishes to repair the marriage between her co-star and her stepson, Brandon Blackstock.Reba's efforts to preach peace, on the other hand, may backfire on her.

"They have to act nice for the cameras, but things are incredibly tight between them," one source told the magazine. "Reba's got it in her mind that Kelly should take Brandon back, which has really angered Kelly."

The "Since U Been Gone" singer divorced her longtime manager last year, ending their six-year marriage following a nasty and public divorce.

In fact, after leaving her stepson's father Narvel Blackstock in 2015 after 26 years together, the 67-year-old singer still has a "soft place" for him.Kelly is still "furious" over her ex-alleged husband's cash grab, according to the source, and there's no way she'll ever forgive Brandon.

"Reba has this delusory faith that Brandon and Kelly can work things out for the sake of the kids.""Kelly's not having any of it. She believes Reba should quit 'The Voice.' The tension's boiling over - and everyone's terrified it'll come out on television," they continued.