Caroline Kennedy has been through many tragedies since the assassination of her father, President John F. Kennedy, when she was just 5 years old. And now, she’s mourning her daughter Tatiana Schlossberg.

Tatiana Schlossberg was remembered at a private funeral on Jan. 5 at St. Ignatius of Loyola, the same New York City church that hosted the memorial service for her grandmother, Jacqueline Kennedy Onassis.

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

The late journalist’s parents, Caroline Kennedy and Edwin Schlossberg, as well as siblings Jack and Rose, were among mourners at the UES church.

Caroline Kennedy has been left fearing over her daughter Tatiana's life after she was diagnosed with terminal cancer.

Tatiana Schlossberg is being honored with a private funeral service in New York City on Jan. 5. The granddaughter of former President John F. Kennedy died on Dec. 30, one month after publicly revealing her acute myeloid leukemia diagnosis in a 'New Yorker' essay.