Unknown to many, Rob Kardashian has been battling with a number of personal struggles, such as weight gain and depression. However, amidst these struggles, a part of the celebrity's life has always been open to the public and this is his siblings' support.

Kardashian, 28, was reported to have been hospitalized on Tuesday and was diagnosed to suffer from diabetes, TMZ reported. Kris Jenner who was in vacation at the time had to fly home to be there for her son.

After his hospitalization, Rob's sister, Khloé Kardashian, posted a picture of herself looking somber, with a caption that says "Melancholy."

Khloé has been a huge supporter of her brother in social media. She recently posted an old picture of herself with Rob, placing the caption, "if only you could see yourself through my eyes."

She also wrote, "I'll forever be obsessed with you! My one and only! #MyAce."

Following that, Kourtney Kardashian also shared a throwback photo on Instagram, with a caption:

"Rob is still struggling and it makes the family sad." A source told PEOPLE earlier this month that, "He deals with depression, weight issues and low self-esteem, but that's been going on for a long time."

Although the whole Kardashian family has been very supportive of Rob, Khloé has been much more open about her brother's situation.

Khloé, 31, recently did an interview with PEOPLE where she talked about her brother's troubles. Apparently, Rob has refused to go on several family events within the past few years, including her sister Kim Kardashian-West's grand wedding.

Khloé told People, "I can't win life for Rob. I have to wait until [he is] ready to do it for himself."

Meanwhile, Kim also did an interview last April where she shared that she thinks that he is just passing through a life phase where he is not comfortable with his own skin. She even added that her brother is working hard to get back to where he wants to be.