Jewish-American businessman Nathan Milikowsky, a cousin of former PM Benjamin Netanyahu, died on Wednesday at the age of 78.
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"Nathan Milikowsky, my beloved cousin, passed away last night after a long illness," Netanyahu tweeted.
"Nathan was the eldest cousin of our clan – incredibly wise, unfailingly kind, always curious, always searching. He spent his last years fighting a horrible disease with the same courage and tenacity that he showed throughout his life," Netanyahu wrote.
"He will stay forever in our hearts. I will miss him as a brother," he added.