Rob Kardashianlooks to have lost weight in footage from his sisterKim Kardashian West‘s low-keybirthday celebrationon Monday night.

In a video that Kim, 39, shared to her Instagram story, a man who appears to be a leaner Rob, 32, is seen in a black shirt and shorts walking through her house. His face is not shown.

Towing behind Rob were Kim’s daughterChicago, 21 months, andKourtney Kardashian‘s daughterPenelope, 7. The KKW Beauty mogul wrote on the video, “I love my family.”

And in a video posted toKhloé Kardashian‘sInstagram Storyfrom the gathering, someone who sounds like sisterKylie Jennercan be heard exclaiming, “Robert! Robert!”

Rob — who is dad to daughterDream Renée, 2½, with exBlac Chyna— has struggled with weight issues over the years. But in June, he revealed on social media that he wasback at the gymfor his first day of a new fitness regimen.

Kim Kardashian/ Instagram

Kim Kardashian birthday

“Day 1 all good,” he wrote, adding strong-arm, pregnant womanand Vulcan saluteemojis.

In June 2018, a source told PEOPLE that Rob “can’t seem to get healthy even though he says he wants to be” and is “constantly up and down” in his weight journey.

The insider noted that he did lose “some weight” after his 2017 breakup with Chyna. “Things were looking good for him,” said the source. “But then drama comes into his life or he goes through tough times and he gives up.”

And the source said he struggled to maintain a healthy diet: “Food is the hardest part for him. He’s a big comfort eater.”

Although he was once a fixture on his family’s reality show, Rob retreated from theKeeping Up with the Kardashiancameras, telling PEOPLE in 2016, “I gained a bunch of weight and was super uncomfortable in my skin. The whole weight thing really affected me.”

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Rob Kardashian

Rob Kardashian/Twitter

rob-kardashian

Despite his bumps in the road, aninsider told PEOPLE in March 2018that, at the time, Rob was “eating better and has a trainer” and felt motivated to “stay healthy for his daughter’s sake.”

“He’s focused on what he should be focused on: Dream and his health,” the source added. “He wants to stay healthy for his daughter’s sake. Dream was a huge wake-up call for Rob. He wantsto be the best dad possible.”

source: people.com