In 2000, Donald is pleased to be given the honour of walking Sally down the aisle at her wedding to Keiran Fletcher but ultimately hands the honour over to Sally's foster brothers Steven Matheson and Frank Morgan. When the 2000 Olympics begin Donald has the honour of carrying the Olympic torch through Summer Bay, but has it switched with a fake by several students. Alf Stewart (Ray Meagher) notices and tells him "Don, stop! It's the wrong flamin' flame!". Following Sam's departure, Donald feels alone again. Seb Miller (Mitch Firth), a dyslexic student, began questioning Fisher and asking questions about Alan. It is later revealed Seb's mother Anna (Elizabeth Maywald) had a one-night stand with Alan at a party in 1985, resulting in Seb's conception, and Anna, who had been dying had wanted to tell Donald. Donald does not want to believe this at first but a DNA test confirms Seb is, in fact, his grandson. Donald and Seb later build a close relationship and live together. Later in the year, Donald goes to London along with Irene and her foster children, Will (Zac Drayson), Hayley (Bec Cartwright) and Nick Smith (Chris Egan) to attend the launch of his book "Letter to Byron". While there, Donald notices Marilyn watching from the shadows and runs after her. After catching up with Marilyn, the two have a conversation about the events of the last several years and agree to part amicably.