Perego also has gathered DNA samples on about 120 descendants of Josephine Rosetta Lyon, daughter of Sylvia Sessions Lyon, who was one of Smith's wives. But Y chromosome evidence, used to determine paternal relationships from father to son, is not present for Lyon because she is female. The effort to determine Lyon's parentage is ongoing, he said.

His most recent findings were presented as a paper at the annual John Whitmer Historical Association conference in Kirtland, Ohio, in late September. The group's officers since have asked Perego to put his presentation into an article format suitable for publication in their next annual journal.

The list of approximately 12 people alleged to have been Smith's children "may grow over time," Perego said, noting historical documents continue to surface. "I'm not saying the list I have is definitive or complete at all. But out of those we have data for, there is no evidence from DNA at this point that Joseph Smith had any children from women other than Emma Smith.

"In the future, if DNA data will be able to be collected and tested, we might know otherwise. But right now, we're able to eliminate five children from that list. There may be some cases we might never be able to test at all."

While Y chromosome DNA is passed from father to son and is most accurate in identifying living people, mitochondrial DNA is passed from mother to daughter and is more often used in paleontology and archaeology, Perego said. As a result, there are distinct limitations on the testing that can be done to date because such testing on a living — and cooperative — male descendant requires an unbroken male line.

Perego has mapped Smith's DNA by retrieving samples from living descendants of two sons he had with Emma Smith — Joseph Smith III and Alexander Hale Smith. "Their Y chromosomes were identical, so we know for 100 percent sure what Joseph Smith's Y chromosome looked like. We can now use that standard to verify any other alleged sons," which he did with those who have been eliminated as possible descendants.

"For 160 years people have been writing in books or speculating that these people could have been Joseph Smith's children. When people write something in a book, many people refer to that almost as a fact. Brodie went on and on about Buell, talking about the timing and the picture — everything seems to indicate Buell was Joseph Smith's son. But the DNA says otherwise."

Perego said he was not only able to eliminate Smith as their father, but also was able to confirm that the men who were married to Hancock's and Buell's mothers were actually their biological fathers.