Her family announced her passing in a social media post from the John F. Kennedy Presidential Library and Museum.

“Our beautiful Tatiana passed away this morning. She will always be in our hearts,” the family wrote.

Schlossberg was a climate change and environmental journalist, the second child of JFK’s daughter, former US diplomat Caroline Kennedy, and the designer-artist Edwin Schlossberg.

In a New Yorker essay published in November, Schlossberg said she had been diagnosed with acute myeloid leukaemia with a rare mutation, a cancer of the blood and bone marrow.

At the time, she also criticised her cousin Robert F. Kennedy Jr., the US health secretary, for being a vaccine sceptic and cutting funding for cancer research.