Koerner, Konrad. 1983. "Holger Pedersen: A sketch of his life and work." Introduction to A Glance at the History of Linguistics With Particular Regard to the Historical Study of Phonology by Holger Pedersen, translated from the Danish by Caroline C. Henriksen. Amsterdam: John Benjamins. (Original Danish edition 1916.)
It may be possible to confirm family relationships with Holger by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Holger: