Chaim Freedman uses DNA testing to verify families' descent >from the Vilna
Gaon.

The evidence, based on Chaim Freedman's research over many years, is
explained on his blog,

http://eliyahusbranches.blogspot.com/2018/08/genetic-master-list-for-relatives-of.html?m=1
[or https://tinyurl.com/ycddp84w --Mod.]

To expand the growing list of Vilna Gaon descendants whose descent can now
be proven by DNA testing Chaim is encouraging people who believe they are
related to the Vilna Gaon to do the test.

Chaim Freedman