“Found out my grandmother and my ex-girlfriends grandmother were sisters.”
to the good people ofAskReddit.
And, let’s just say the results were shocking, dark, and truly WILD.

Check it out:
1.
“My grandfather did not die when my dad was four like we always thought.
theloneliestdonkey
2.

“Had something similar.
My grandfather was always told that his grandfather died in the war.
After years of digging, it turns out he had five wives divorcing none of them.

I got a very sharp response telling me how awful he was and to never mention his name again.
“Not me but my coworker found out his bio dad was not who he thought he was.
PotatoPuzzled2782
4.

She was distraught, thinking her parents had lied to her for her entire life.
Customer service just said, Oh well and offered a new test.
Lennyotter
5.

“My mom’s generation has been really big into tracing our family tree.
So we’re thinking some downright unholy things went on.
Unclear as my grandfather and aunt are both dead now.”

Wonderful-Image669
6.
“Grew up pretty normal for the most part, divorced parents but happy life.
Wanted to know my ancestry since I dont know past my paternal great-grandmother’s maiden name.

Got the results this past Christmas Eve.
Cant ask my mom, shes dead.
I just found out this big ol bombshell so suddenly and then hit a dead end just as quickly.
It was an interesting and juicy Christmas for sure.”
Whythen
7.
“Well, it’s notmyhorror story.
It took 40 years, but I imagine this is a hell of a horror story for him.
He wasn’t ever a suspect before the DNA match.”
jait
8.
It didn’t work.
Swarley_S
9.
My sister-in-law did some digging and found my real biological father.
He died from COVID complications just eight months after we found out he was my real dad.”
endedjustaslovers
Kristen242008
11.
“One of my best friends called me one day in a panic.
She did a DNA test with her father for fun.
He is not her father.
Turns out mummy has many skeletons in the closet.
Bio dad never knew she existed and was SO happy to find her.
We now doubt her sisters father is her father.
Just a gigantic domino effect of not good.”
90212Poor
12.
We now have family members who wont take the test.”
threadbarefemur
13.
“My father is from a country that is literally split in half.
Half the country is ethnically Greek and the other half is ethnically Turkish.
There is a long history of bad blood and our capital is split down the middle.
Not really a horror story, but goes to show how stupid war is.”
henlogreeting
14.
“Found out my Dad isnt my biological father.
My Dads sister gave me a DNA test for the holidays.
But I have 10+ half-siblings with whoever my sperm donor dad is.
Then finally admitted it was true after 6+ months of lying.
We now have a terrible relationship.”
mybabylasko
15.
“My sister found out that half our mom’s side of the family, are products of incest.
Up and until, a few great aunts and uncles.”
cgtdream
16.
“I’ve got Two: My friend knew that she was the result of a sperm donor.
She signed up for 23andMe and ended up finding that she has a half-sister!
“The other one is more direct one of my family members got tested and found a cousin.
Probably one of my uncles that passed away, or something along those lines.
I just don’t want to know, it would just stir up crap.
Ignorance is bliss.”
CyberBill
17. girovalover
18.
“I’m adopted and was hoping to find out family info and hopefully who my birth parents were.
Also, he committed multiple armed robberies in the past.
That whole side of my gene pool is into weird religious stuff.
Plus the guy he thought was his father isn’t.
Safe to say I want zero contact from anyone on that side.
Far-Connection-3660
19.
And the father in all this has passed on, so…
I got a sister now!
Snoringdragon
20.Found out that my (ex) girlfriend was actually my cousin.
In college I became a DJ at the student radio station and ended up meeting her through that.
‘Wow, cool coincidence!’
We both have a family history of BPD and Raynauds.
‘Hey, well know how to take care of each other!’
Laying our arms next to each other they looked nearly identical.
‘Its like we were made for each other!’
A few months later Im talking to my uncle before Christmas dinner.
Hes a big genealogy nerd and has hundreds of years of our family tree plotted out on Ancestry.
When I joined the conversation he was talking about a gravesite he visited from some relative in the 1700s.
Im learning about my great-aunt and suddenly I feel sick because it all slides into place.
My great-aunt is my exs grandmother.
My ex is named after MY grandmother, who is her grandmothers sister.
I havent contacted her to tell her, because how do you tell someone that kind of news?
‘Heyyy, you know how we were dating and almost had sex?
Well, Im glad we didnt because youre my cousin haha!’
TL;DR: My grandmother and my ex-girlfriends grandmother were sisters.
She had an incredible background.
North American First Nations.
Portugal and all over Europe.
It was so cool!
When I got mine back it said, ‘Youre Scottish mate.’
I just found it hilarious if you compared the findings.”
Youre from where you currently live.
Her family are clearly not very adventurous. "
Worganx23
Note: Some responses have been edited for length and/or clarity.