A Kennedy family friend speaks with PEOPLE about the heartbreaking aftermath of Tatiana Schlossberg's untimely death

As the Kennedy family mourns the death of 35-year-old Tatiana Schlossberg, her mom Caroline Kennedy is reportedly drawing strength from her late mother Jackie Onassis Kennedy. A source told People that Caroline is focused on keeping her daughter's "memory alive" for Tatiana's son Jack and daughter.

Members of the Kennedy family poured in condolences for Tatiana Schlossberg, the granddaughter of President John F. Kennedy and daughter of Caroline Kennedy who died Tuesday at the age of 35, weeks after revealing her terminal cancer diagnosis.

Caroline Kennedy's daughter, Tatiana Schlossberg, lamented bringing 'another tragedy' to her famous family in the emotional essay announcing her terminal diagnosis

Tatiana Schlossberg, daughter of Caroline Kennedy and granddaughter of President John F. Kennedy, has died following a battle with terminal cancer. "Our beautiful Tatiana passed away this morning," the JFK Library Foundation said in a statement on Tuesday. "She will always be in our hearts."

Environmental journalist Tatiana Schlossberg, one of three grandchildren of the late President John F. Kennedy, has died after she was diagnosed with leukemia last year. She was 35.

Tatiana Schlossberg, President John F. Kennedy's granddaughter and Caroline Kennedy's daughter, has died. She was 35. Her death was confirmed Dec. 30 by the The John F. Kennedy Library Foundation, the non-profit organization that provides financial support, staffing and creative resources for the former president's library.

Tatiana Schlossberg opened up about her health problem in an essay which was published a month before her demise.

JFK, the son of Joseph Patrick Kennedy and Rose Fitzgerald Kennedy, was born in Brookline, Massachusetts, on May 29, 1917. He was the second of nine children the couple shared.