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Scott Disick, Kourtney Kardashian

Angela Pham/BFAnyc/Sipa USA

Kourtney Kardashian wanted Scott Disick to step up, and he has.

Months after the longtime couple called it quits, a source tells E! News exclusively that they are now standing on solid ground for the first time in a long time.

"Scott has been integrating back into the family and things are going really well. They're a family unit again," the source reveals. "When Kourtney talks about them, she says 'We.' It's no longer just her and the kids. It's all of them."

Kourtney's family has publicly embraced Scott, too. Her mom and manager, Kris Jenner, even shared a selfie she had taken with Lord Disick and posted it on Instagram Tuesday afternoon. "This is one of the true loves of my life," the Keeping Up With the Kardashians star wrote in the caption. "Feel so blessed to have him as the baby daddy to my Grandkids. You are amazing @letthelordbewithyou and I love you. #proudmama #memories #family #youareeverything."

Weeks ago, Kim Kardashian, admitted to E! News that the family was still adjusting to her sister's breakup with Scott. "It's a hard adjustment," the pregnant reality star said, adding, "We love Scott, too. He's family. So that makes it hard for everyone, even though you might not agree with someone's actions."

Having the family's support made it easier for him to get his life back on track. "He has really picked up the slack on daddy duty," the source says of Scott, who entered rehab post-split. "He's committed. He's helping with the kids and everyone, Kourtney included, sees how much he's trying." As a result, the source says, "There is no question the family is back together."

Kourtney did her best to shield their three children—Mason Disick, 5, Penelope Disick, 3, and Reign Disick, 11 months—from Scott's issues, both before and after he sought treatment. And while Kourtney is not yet considering a romantic reunion, she cares deeply for Scott. "They've always loved each other," the source reveals to E! News. "And she let him back into the family."

That said, there are concerns that Scott could spiral out of control again.

"Kourtney may join Scott in Las Vegas for New Year's. It's open for discussion. There's a chance she'll go with him," the source says. "Everyone—Kourtney included—would prefer he not do it. But it's something he has to do because he blew off so many appearances with them. He owes them. Kourtney understands it's part of the business side of things." Even if Kourtney doesn't attend, the source explains that Scott will be " be very, very closely watched when he's there."

A new episode of Keeping Up With the Kardashians airs Sunday at 9.m. on E!