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While neither the stage show nor the film reveals who Sophie's real father is, there is an official answer. According to Catherine Johnson and Phyllida Lloyd, Sophie's real father is Bill. Bill's character was Australian in the original stage production, but in the film he became a Swede instead, and he's played by Swedish actor Stellan Skarsgård. This means the film's Sophie has her roots in Sweden - just like "Mamma Mia!" See more...
Mamma Mia! (2008) - 7 major mistakes
starring Christine Baranski, Colin Firth, Julie Walters, Meryl Streep, Pierce Brosnan, Stellan Skarsgard (add more)