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[crosbey]

I've been adding my brother-in-law's family into my tree. His grandparents came up that they were believed to be related to another individual based on DNA results. I don't understand how they linked his grandfather, as he's been deceased for several decades & my brother-in-law is adamant neither he, his cousins, parents, aunts, uncles, etc were ever DNA tested. How would his grandfather have ended up in the database? How accurate are these records/results?

The family only knows information going two generations back. My brother-in-law is Jewish and some family members are confirmed killed in the Holocaust while others are still officially listed as missing.

[tai38]

No doubt you are talking about the Y test. The Y is passed from father to son. In other words he got it from his father, his father, his father and so on. Some male who is descended his grandfather or his grandfather's father or his grandfather' brother etc could have taken the test. If they are all in the direct male line they would have the same Y. It could have been a descendant of his grandfather's great great great grandfather that took the test and that person knows enough about the family history that he know your brother-in-law's grandfather was a descendant. The best thing to do is to contact the person who was tested and find out more about what information he has. That is how Y testing is valuable. By making contact with others that have the same Y results you find out more Information on your family tree. It just might be a great opportunity for your brother-in-laws' family to find family that has survived.