It’s been three months since the legendary actor Kirk Douglas passed away at the age of 103. Now, his son Michael Douglas and daughter-in-law Catherine Zeta-Jones are speaking out to pay a touching tribute to him.

“There wasn’t anyone like him,” Michael told Entertainment Tonight of his father. “There’s another generation, that was the great generation, post-World War II … and Dad was one of kind.”

Michael and his wife Catherine are currently working on a fundraiser called “We All Play Our Part: A Benefit for MPTF,” referring to the Motion Picture & Television Fund. The benefits will go to its COVID-19 Emergency Relief Fund.

When asked what his father would think of his efforts, Michael said he would be “very happy.”

“I know he takes particular pride — not so much in whatever I worked with and I’m doing with the Motion Picture Television Fund — but I know he loves Catherine [and] the work that she’s doing,” Michael said. “He always used to tease me. We would call him up and he would be like, ‘Enough with you, let me talk to your wife.’ He was a flirt until the very end.”

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It is with tremendous sadness that my brothers and I announce that Kirk Douglas left us today at the age of 103. To the world he was a legend, an actor from the golden age of movies who lived well into his golden years, a humanitarian whose commitment to justice and the causes he believed in set a standard for all of us to aspire to. But to me and my brothers Joel and Peter he was simply Dad, to Catherine, a wonderful father-in-law, to his grandchildren and great grandchild their loving grandfather, and to his wife Anne, a wonderful husband. Kirk's life was well lived, and he leaves a legacy in film that will endure for generations to come, and a history as a renowned philanthropist who worked to aid the public and bring peace to the planet. Let me end with the words I told him on his last birthday and which will always remain true. Dad- I love you so much and I am so proud to be your son. #KirkDouglas

A post shared by Michael Douglas (@michaelkirkdouglas) on Feb 5, 2020 at 3:33pm PST

Catherine agreed with her husband about his father.

“Oh yes, he’s a great flirt,” Catherine said. “He crosses our minds every day. But for me, during this time of, ‘OK, we are all locked down, what do you do?’ It’s so easy to go into a procrastination vibe. And Kirk, he went through so much from a helicopter crash to a stroke and then just age, being alone and what does he do with this time.”

“And what was so admirable about him was he was always involved with courage events, he wrote 11 books, he worked with his rabbi, he worked with his philanthropic endeavors and he always created something to do and he taught me that lesson,” she added. “He always said to us, ‘Write a book, do something else. What are you doing?’ And he’d be working on something right now, I’m sure.”

Kirk was a World War II veteran who survived a helicopter crash, a stroke, and two knee replacements while also starring in 80 movies. There will never be another star like him, and he is dearly missed!