Separated on a family vacation with their father Prince Charles while Diana was on various humanitarian trips, the two boys were scheduled to meet up with their mother again on August 31 – the day that she died at just 36 years old.
The two boys, who were 15 and 12 years old at the time of their mother’s death, spent time with Diana and her partner Dodi Fayed’s family earlier in the summer.
But when Diana and Dodi were killed, William and Harry were at Scotland’s Balmoral Castle, spending the remainder of the summer with their grandmother Queen Elizabeth II and their father Prince Charles.
Speaking on 2017 documentary Diana, Our Mother: Her Life and Legacy, Harry spoke to two landmine victims, who met with Diana on her very last humanitarian mission.
“You guys were almost the last people to see my mother,” Harry told Malic Bradaric and Zarko Peric in the documentary.
“Well, you saw my mother more recently than I did, I guess,” he said.