Mikson was the father of Jóhannes Eðvaldsson, who played for Celtic F.C. in the seventies, and Atli Eðvaldsson, former player for Borussia Dortmund and player and coach of the Icelandic national football team.
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In 1946 he was transported to the Norwegian border where a boat to Venezuela waited in Halden.
Eðvaldsson's father Evald Mikson was a former Estonian international goalkeeper in the 1930s, who was later Deputy Head of the Tallinn Police during the Nazi occupation.