Question: When was Patrick Berg's father born?

Context paragraphs:
title: Theodred II (Bishop of Elmham)
paragraph_text: Theodred II was a medieval Bishop of Elmham. The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
title: Patrick Berg
paragraph_text: Patrick Berg (born 24 November 1997) is a Norwegian footballer who plays as a midfielder for Bodø/Glimt. He is the son of former Rosenborg and Bodø/Glimt player Ørjan Berg.
title: Terence Robinson
paragraph_text: Terence D. Robinson( date of birth and death unknown) was a male wrestler who competed for England.
title: Brian Saunders (weightlifter)
paragraph_text: Brian Saunders( date of birth and death unknown) was a male weightlifter who competed for England.
title: Ørjan Berg
paragraph_text: Ørjan Berg (born 20 August 1968 in Bodø) is a former Norwegian football midfielder, who most recently played for Rosenborg. He retired at the end of the 2006 season, and has previously played for F.K. Bodø/Glimt, FC Wettingen, TSV 1860 München, and FC Basel. Ørjan is the brother of Bodø/Glimt player Runar Berg, and the son of legendary Bodø/Glimt midfielder and playmaker Harald Berg. He is the current sporting director of Bodø/Glimt. He is married and has two sons, Patrick and Marius.
title: Etan Boritzer
paragraph_text: Etan Boritzer( born 1950) is an American writer of children ’s literature who is best known for his book" What is God?" first published in 1989. His best selling" What is?" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals. Boritzer gained national critical acclaim after" What is God?" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views. The other current books in the" What is?" series include What is Love?, What is Death?, What is Beautiful?, What is Funny?, What is Right?, What is Peace?, What is Money?, What is Dreaming?, What is a Friend?, What is True?, What is a Family?, What is a Feeling?" The series is now also translated into 15 languages. Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy. His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education. Boritzer now lives in Venice, California and maintains his publishing office there also. He has helped numerous other authors to get published through" How to Get Your Book Published!" programs. Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally. He is also recognized nationally as an erudite speaker on" The Teachings of the Buddha."
title: Les Richards
paragraph_text: Les Richards( date of birth unknown) was an Australian rules footballer who played with North Melbourne in the Victorian Football League( VFL).
title: Z Berg
paragraph_text: Elizabeth Anne "Z" Berg (born June 28, 1986) is an American musician. She was a founding member, guitarist, and lead vocalist of the indie rock group the Like. Berg's father is former Geffen Records A&R exec/record producer Tony Berg.
title: Harald Berg
paragraph_text: Harald Johan « Dutte» Berg( born 9 November 1941 in Bodø) is a former Norwegian playmaker and midfielder, nickname" Dutte". He is the brother of Knut Berg, the father of Ørjan Berg, Runar Berg and Arild Berg, and grandfather of Patrick Berg( son of Ørjan) – all of whom have played in the Norwegian Premier League.
title: Lars Patrick Berg
paragraph_text: Lars Patrick Berg( born 22 January 1966 in Frankfurt) is a German politician who is serving as an Alternative for Germany Member of the European Parliament.

Reasoning steps:
Patrick Berg father Ørjan Berg
Ørjan Berg date of birth 20 August 1968

Answer: spans: 20 August 1968