Movies
Rex Features
The Australian star has been awarded a posthumous nomination in the best supporting actor category for his role as the Joker in The Dark Knight.
Speaking to TMZ, Kim Ledger said: "You can't expect to win something like this. [The Academy] could just as easily turn left, as it could go right. You can't take anything for granted."
"I'm extremely proud," he added, hinting that he "may say a few words" if his son does win.
He revealed that most of Ledger's family have travelled from Australia to Los Angeles for the event but admitted that the ceremony will be a "bittersweet" affair.
The 81st annual Academy Awards will be broadcast live on ABC on Sunday night.
Movie Reviews
'Extremely Loud & Incredibly Close' reviewTom Hanks features in a long and winding journey through New York after 9/11
At the Movies
David Lynch: 10 reasons to worship himIt's time to celebrate director David Lynch as the BFI screens a season of his films.
Movies Interviews
Max von Sydow 'Extremely Loud' interviewActing legend Max von Sydow on Extremely Loud & Incredibly Close, The Exorcist and Flash Gordon.
Box Office Charts
'The Woman in Black' wins UK box officeThe Woman in Black beats The Muppets and Star Wars at the the UK box office.
