Stellan Skarsgard didn’t deliberately raise his four sons to be actors. The 73-year-old ‘Mamma Mia!’ star is father to eight children from two marriages and four of his sons – Alexander, Gustaf, Bill and Valter – have all followed him into the business but Stellan is adamant he didn’t set out to create a family acting dynasty. He told the Guardian newspaper: “I didn’t care what they became when they grew up, they could do anything. But obviously they saw that I had fun doing the acting stuff, so they became actors. “They’re all very different. I am amazed how different they can be from each ot…