"My first love," Kourtney captioned a throwback photo of herself with her dad on social media. She later tweeted, "Blessed and magical night" with heart, prayer and rose emojis.
Kourtney and her family ate Armenian food in honor of her late dad's heritage, as seen in a live stream on sister Kim Kardashian's website and app.
Kim's daughter, North West, dressed as Elsa from "Frozen," while Kourtney's daughter, Penelope Disick, dressed as Anna.
"You know it's been a good night when you've finished your family dinner and you realize Elsa's sister Anna left her hair behind. #penelope #frozen #magical night," Kris Jenner, Kourtney and Kim's mom and Robert Kardashian's ex-wife, captioned a photo of the dinner table.
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Kourtney's sons Mason Disick and Reign Disick were also present.
Kourtney and Disick were together for nine years before splitting in July.
The pair previously came together for the Thanksgiving holiday, but their reunion Monday was overshadowed by reports Disick spent the previous week partying at New York Fashion Week.
"He was a total mess," a source told People of Disick, who has struggled with substance abuse issues for years. "He was doing well for a long time. It's sad and worrisome ... Hopefully he can go back to being healthy. He doesn't want to disappoint Kourtney or his kids."
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