President Donald Trump’s younger brother Robert tragically passed away on Saturday at the age of 71. Now, the president’s daughter Ivanka Trump is taking to Twitter to pay tribute to her late uncle.

“Uncle Robert, we love you. You are in our hearts and prayers, always,” Ivanka tweeted in the wake of his death.

Ivanka’s brother Eric also paid tribute to Robert on social media, calling him an “incredible man.”

“Robert Trump was an incredible man – strong, kind and loyal to the core,” he tweeted. “Anyone who encountered him felt his warmth immediately. He will be deeply missed by our entire family.”

Robert died just one day after President Trump visited him in the hospital in New York.

“It is with heavy heart I share that my wonderful brother, Robert, peacefully passed away tonight,” Trump said in a statement after his death. “He was not just my brother, he was my best friend. He will be greatly missed, but we will meet again. His memory will live on in my heart forever. Robert, I love you. Rest in peace.”

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Born in 1948, Robert was the youngest of the five Trump siblings. He launched a career on Wall Street initially before joining the family real estate business, according to Live Mint. Though he was much quieter than his older brother, Robert became an integral part of the Trump Organization and was fiercely loyal to the president all his life.

Though he usually stayed out of the spotlight, Robert made headlines earlier this year, when he filed a lawsuit on the behalf of the Trump family seeking to stop publication of a tell-all book by the president’s niece Mary, titled “Too Much and Never Enough.” The Trump family alleged that Mary’s book violated a nondisclosure agreement she had signed in connection to a financial settlement she received from the family years prior.

At the time of the filing, Robert said that he was “deeply disappointed” in his niece’s decision to write such a book and that he and the “entire family” were “so proud of my wonderful brother, the president.” Mary is the daughter of the president’s eldest sibling, Fred Trump Jr., who struggled with alcoholism and died in 1981 at the age of 43.