He recently shared a snap of them wearing matching uniforms before heading out to start the new school year.
And Sir Elton John's sweet sons Elijah and Zachary must have been working hard in the classroom as he gave them a weekend treat of tickets to the Watford game on Saturday with the international pop superstar and his husband David Furnish.
The singer, pianist and composer - who took up the role as chairman of the north London football club in 1976 - was pictured holding the hand of Elijah, four, as Zachary, six, clung to David.