Elton John fears his son Zachary will be taunted at school for having two fathers and no mother.

The British rocker and his partner David Furnish welcomed their surrogate son in December 2010, but the "Rocket Man" is afraid the youngster will face difficult times when he starts his education.

He tells the Radio Times, "Being the child of someone famous is a huge ball and chain around your ankles. It's going to be very difficult... At school other children will say: 'You don't have a mummy.' We've come a long way but there's still homophobia and will be until a new generation of parents don't instill it in their children."