The Celebrity Big Brother star marked his dad's day by tweeting: "Happy birthday dad. Miss you everyday. Proud to be your son and keep you legacy alive. Best wishes RIP."
Football legend George, a recovering alcoholic, died in November 2005 after suffering multiple organ failure.
Reality star Calum spoke about his father's legacy during his time in the CBB house earlier this year, when fellow housemate Ken Morley sneeringly asked if he'd burned through his dad's inheritance yet.
Model Calum responded the only thing he received from his dad was a "lovely name and a great legacy." He also opened up in the house about the "dark place" he was in following his father's death as he struggled to cope with his loss.
Calum released a book earlier this year called Second Best: My Dad and Me, detailing life with the football icon and living with an alcoholic parent.
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