Prince Charles, Prince William and Princess Anne have all carried out some kind of engagement since Philip's death.
The brothers walked behind their mother's coffin in 1997, at their grandfather's behest.
The boat was a benefit for Gordonstoun pupils 'with no particular family home' to go to during breaks.
The pictures were unearthed from a private collection and show Philip looking after a 13-year-old Elizabeth.
Sally Osman, who was the director of royal communications, said the duke could be 'direct' at times.
Buckingham Palace has confirmed who will be at the ceremony on Saturday, including one of the duke's close friends.