That is neat and a great side-product of what I know is hours and hours of research.
My mother and my sister did Ancestry DNA tests. I have my hard copy of my material from 15+ tears ago. And now the LDS site and Ancestry have computerized material, that wasn't there over 15 years back.
So the gal contacts my sister, and we start in from our side. We narrow it down, send her what we had. Her daughter picks it up.
Mother lives in White Horse, Yukon Terr. Daughter lives in Grand Prairie Alberta. Mom was adopted, said to be born in Winnipeg, records sealed until this year. Thinks name was Linn or Linnell.
My records cover my Swedish immigrant ancestors that first settled in Minnesota in the 1850s. I send them my stuff, tell them about other sources, etc.
After a few days the daughter sends some photos from her handwritten family tree on paper n her dining room table. She confirmed they did indeed connect with the Swedes in Minnesota, and a chap that went to Winnipeg.
But that still left out a few generations. In the meantime the provincial records previously sealed, were available if she knew who and where to ask about.
And she filled in one side, and awaits the other in a few weeks.
We got a warm thank you. We are pleased to help, and happy to add nice people to the family.
Early in my research years ago, I surmised that many families would up split between Canada and the US, and that turned out to be true.
In our case, on both mother's side and father's side.