If you had access to a large genetic database, it would theoretically be possible to find living relatives, provided at least one (even quite distant) relative is included in that database. It may be possible to then retrace familial history to determine who specifically it may have been.
That’s more or less how they managed to find the Golden State Killer. Someone noticed that the GSK’s DNA had distantly related DNA listed in GEDmatch’s private database and family trees were constructed to narrow down suspects until only one remained based on timing, location, and other details. The person listed in the database and the GSK were so distantly related that they only shared a great-great-great-great grandfather.
If you had access to a large genetic database, it would theoretically be possible to find living relatives, provided at least one (even quite distant) relative is included in that database. It may be possible to then retrace familial history to determine who specifically it may have been.
That’s more or less how they managed to find the Golden State Killer. Someone noticed that the GSK’s DNA had distantly related DNA listed in GEDmatch’s private database and family trees were constructed to narrow down suspects until only one remained based on timing, location, and other details. The person listed in the database and the GSK were so distantly related that they only shared a great-great-great-great grandfather.