Like DFNU has said -
Ancestry can bring many secrets to light. And that's good and bad for some. One can literally find a sibling, child, mother/father that they did not know existed. I can't imagine the myriad of emotions that occur.
I heard of a story of a man that went after ancestry.com for erroneous results. Finally his elderly mother told him the truth. That a family friend was really his father.
For some that already know and are looking for this exact reason, well I'm sure it's wonderful for them. But still so emotional.
And DNA is not where you know your ancestors lived on paper. That is often a surprise for many. Both my mother's parents came here from Ireland. Grew up there. She knew nothing more than Irish, Irish and Irish for generations back. And assumed that. It's interesting to learn that even if that's all you know, people are transient over time. People came and conquered etc. My mother learned so much more of her parents' DNA, through her, including very strong Scottish and Scandinavian backgrounds.
We also were contacted by her cousin in Belfast who was overjoyed to find the branch that left and came to Canada. That was lovely for him and very interesting for my mother to hear.
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OT, but I would love for everyone to be forced to see their DNA somehow.
A fair amount of racists, and prejudiced people, would be very surprised. I find that part comical.
Watching shows like Finding Your Roots should be required in schools. They just had Lupita Nyong'o on the program. She has DNA, I believe it's called mtdna Eve, that has proven to be the earliest DNA on record. I think that would be great for black children to know and learn especially, and for all children to learn.
And for some adults to highlight their ridiculous behaviour.