The family remains quiet about Rob's reported hospital visit.
As of Wednesday morning, the Kardashian-Jenner clan had yet to address Rob Kardashian's reported diabetes that landed him in the hospital -- but his sister Khloe Kardashian did post a cryptic Instagram pic.
The 31-year-old reality star shared a sad selfie with the message: "Melancholy."
In her recent memoir, Strong Looks Better Naked, Khloe -- who's admittedly the nurturer of the family -- wrote that catering to her brother's every whim wasn't best for him.
WATCH: Khloe Kardashian Admits to 'Babying' Her Brother Rob -- I Made Life Too Easy for Him
"I was constantly checking up on him, making sure he had the food he liked, seeing if he needed anything from the store, asking what I could do to make him more comfortable," she recalled. "My sisters said I was babying him and that he'd never leave the house if I didn't let him fend for himself. I argued with them because it was an emotional issue, and emotion tends to cloud your thinking."
Khloe says she has accepted that she can't fix her 28-year-old brother, who still lives with her. "He will make changes in his life when he is able to motivate himself," she explained. "And as much as I wish I could light that fire for him, I now see that the chances of that happening are slim to none."
WATCH: Khloe Kardashian -- I Call Rob My Son As a Joke
After Rob was noticeably missing from the family's Thanksgiving photo, Kris Jenner spoke out on her son's behalf. "He's doing alright, he's doing his best," she revealed on the Sirius XM radio show, Conversations With Maria. "He's working on himself. He's gonna be OK."
Rob was recently taken to a hospital after he wasn't feeling well over the weekend. Doctors stabilized him and diagnosed him with diabetes, which Rob wasn't aware he had, according to TMZ.
MORE: Rob Kardashian Posts Throwback Picture, Suggests Milkshakes Kicked Off His Weight Gain
Here's a look at how Keeping Up With the Kardashians foreshadowed Rob's health struggles:
