Christian Ulvaeus
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Peter Christian Ulvaeus (born 4 December 1977) is the son of Agnetha Fältskog and Björn Ulvaeus, two of the members of Swedish pop group ABBA.
At the age of 10, he recorded a children's CD with his mother which included a hit song in Sweden called "På Söndag". At university he studied physics and engineering, and has also designed a military strategy computer game called "Strategica".
Currently, he has a business partnership with Roger Sonnenfeld (the son of his former step-father) and Dennis Persson called Studio Centurion, which, amongst other things, developed the website for his sister, Linda Ulvaeus.