May 11, 2016 02:05 PM

Rob Kardashian‘s transformation was a “miracle” according to his sisters Kim and Khloé, but they weren’t initially happy how it all came about.

In a sneak peek at Sunday’s Keeping Up With the Kardashians, Kim and Khloé discuss the issues surrounding their baby brother’s new romance with Blac Chyna.

In the clip, Khloé says it’s a miracle to see Rob, 29, out and about and all over social media, considering he didn’t even want to leave his bedroom to attend Christmas the past three years.

“She gave him confidence,” Kim, 35, replies, giving credit to Chyna, 28. “More power to her.” She also said that Rob’s relationship with Chyna has caused drama within the family, but if this is what it takes for him to feel better about himself, then she doesn’t care “who he is dating.” (The couple has since gotten engaged and announced they are expecting their first child together.)

That said, Kim does admit that she wasn’t happy how it all went down: “My thing is, do what you want, do what makes you happy, but he should have said to us, ‘Hey guys, this is how I feel. I can’t help who I love. And I fell in love with her. Kylie should know this,’ ” Kim explained to Khloé.

She adds, “He just has no loyalty.”

Khloé says, “Am I happy he’s out and about? Sure. Am I disappointed that Rob isn’t talking to me after he got out of my house? Yeah.”

She continues, “I’ve been the only one who has stood by him and defended him and wanted the best for him. That’s where it gets frustrating.”

Since filming this scene, the pair have mended their relationship, and Khloé shared the happy news by posting a photo of her and Rob holding hands last month.

Keeping Up with the Kardashians airs Sundays (9 p.m. ET) on E!

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