Kim, Kourtney and Khloé Pay Tribute to ‘Loving' Brother Rob Kardashian on His 37th Birthday: 'Best Brother in the World'

Kris Jenner also joined in, calling her only son "one of the most loving, generous, kind, caring men I’ve ever known"

Rob Kardashian is being showered with love on his birthday!

On Sunday, the youngest of Kris Jenner’s kids with the late Robert Kardashian turned 37, and his siblings and mom marked the occasion by posting tributes to him on social media.

“You are the most incredible son a mother could ever ask for and one of the most loving, generous, kind, caring men I’ve ever known,” Jenner, 68, wrote on Instagram as she shared a carousel of adorable photos from Rob’s childhood and a sweet shot of him with his late father.

“You will never know how much of my heart you hold," she continued. "You are not only an amazing son but the world’s best daddy to Dream, and she loves you so much!!!! It is such a joy to see you grow as a father with every year that goes by, and I hope you know how proud I am of you every single day.”

Jenner added, “I am so SO blessed and I thank God that he chose me to be your mommy. I am the luckiest mother in the whole world!!!!”

Related: All of the Lucky Celebs Born on St. Patrick's Day

Khloé Kardashian shared a similarly lengthy tribute on Instagram, as she wished her “baby bobby boy” a happy birthday.

“Robert I couldn’t be prouder or more honored to say I am your sister. I couldn’t be prouder to be living life with you. I couldn’t be luckier that I get to call you whenever I want about absolutely nothing. And the coolest part is, you actually answer the phone for me ha! I thank God every day for our relationship and the relationship that our children get to have,” she wrote, referencing the close relationship that Rob’s daughter, Dream — whom he shares with Blac Chyna — has with her kids, True and Tatum.

“I couldn’t be more blessed or excited that I have an entire lifetime with you! Genuinely you are one of the most loving, hysterical, gentle and majestic human beings I’ve ever known. Being your sister is an absolute privilege.”

Khloé, who shares a particularly tight bond with her brother and his daughter, continued: “I have so many hopes and dreams for you. I dream that you wake up one day and you know with everything inside your being that you are enough. I pray you realize that WE are the lucky ones because we get to share space with you. I dream for you to be happy. I want deep peace to enter your life and never leave your side. I dream for you to realize your potential on this planet.”

She praised her brother as “loving, compassionate, caring, intelligent [and] respectful” and encouraged him to “let go of the pressure” of his past and “thrive at your own pace.”

Concluding the tribute, Khloé, 39, called Rob her “bestie for the restie” as she shared an inside joke between the siblings: “You’ll forever be my best Newsie ‘open the gates and seize the day.’ ”

Related: Khloé Kardashian's Son Tatum Is Her Brother Rob's Twin in Sweet New Photos: 'How Is He This Big Already?'

Kim Kardashian joined in on the love in her own post for her brother as she called Rob "the sweetest funniest best brother in the world!"

"I love you so much and so blessed to have u as my brother! ♾️🩶🍀," she continued in her caption as she shared a throwback photo with Rob.

Kourtney commented on her sister's post, "The actual best brother in the world," while Khloé wrote, "💚💚💚."

The Lemme founder, 44, also weighed in, as she reposted a throwback photo with her brother on her Instagram Story and added a “🍀” in honor of his birthday falling on St. Patrick’s Day.

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Since stepping back from the spotlight several years ago, Rob has led a largely private and quiet life compared to his famous family. He rarely appears on social media, and is infrequently featured on The Kardashians, but Khloé revealed in season 3 of the Hulu show that her brother "talks about" returning to the show "a lot."

"I do think Rob would come back to the show," she said after producers asked if Rob would ever appear on the series. "But I do know that Rob has been through a lot personally."

The Good American founder continued of her brother, "He's literally the best dad I know and I'm so proud of him for that. And I know that he is feeling really good about himself and I'm happy for him so I have faith that, soon, he’ll be back on the show."

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