Question: When was the son of Arnór Guðjohnsen born ?

Context paragraphs:
Eiður Guðjohnsen: Eiður Smári Guðjohnsen (born 15 September 1978) is a former Icelandic professional footballer who played for the Iceland national team as a forward.

Arnór Guðjohnsen: Arnór Guðjohnsen (born 30 April 1961) is an Icelandic former footballer who played as a striker.  He is most famous for his seven-year stint with Belgian club Anderlecht and was the top scorer in the 1986–87 season.  He is the father of striker Eiður Guðjohnsen.

Supporting paragraphs: Arnór Guðjohnsen Eiður Guðjohnsen
Answer: 15 September 1978