The study’s researchers did not identify these men publicly. Their participation was described in general terms: they were men whose documented paternal genealogy intersected with Beethoven’s at the level of Hendrik van Beethoven (approximately 1572), and their Y chromosomes were compared against the Y chromosome extracted from the authenticated Beethoven hair. The identities of the participants, their specific genealogical connections, and any additional information about them were not published.
This approach reflects the ethical framework that the researchers applied to the living participants in the study. The comparison required data from living individuals, and those individuals had consented to having their genetic data used for genealogical research. The use of their data in a study about a historical figure’s paternal lineage was arguably within the scope of that consent, but it was also a use that they may not have specifically anticipated when they enrolled in the genealogical database.
The finding itself—a discrepancy in the Beethoven paternal line between 1572 and 1770—is simultaneously a finding about the composer’s historical genetics and a finding about the biological history of the living participants’ family line. The same extra-pair paternity event (or events) that separated Beethoven’s Y chromosome from the living relatives’ Y chromosomes also separated those living relatives from a shared ancestor at a specific point in the documented genealogy. For the living participants, this is a personal genealogical finding, not only a historical curiosity.
How the living participants learned about and processed this finding—whether they were informed before the study’s publication, how they were told, and what it meant to them—was not described in the public reporting on the study. This is an area where the ethical norms of historical genomics research are still developing. The convention in genetic genealogy databases is that participants may learn unexpected things about their ancestry, including discoveries about extra-pair paternity in their family lines, and most databases provide some framework for how these findings are communicated. Whether this framework is adequate for the particular situation of discovering that your paternal genealogy diverges from that of a historical figure’s is a question worth considering.