When it comes to the wonderful world of dating, it's often said that for every lid there's a pot.
Unbelievably, however, this is exactly what happened to blogger Marcella (@beingmarcellahill) who realised the shocking truth while she was pregnant with this child.
While most people would keep something like this to themselves, she decided to share the story on TikTok where it quickly went viral.
She said: "So I've never told anyone publicly that I accidentally married my cousin."
The blogger explained that it all went down when she was searching a family tree website looking for baby names while pregnant.
"I was sitting on the couch looking for the baby we're about to have and I was on a family search site," she said. "I was like 'Oh look, grandpa's name, grandma's name, great grandma's name, great grandma's name.'
"My husband was next to me on his own family search and was like 'oh that's funny - we have the same grandma and grandpa's names'."
It was then that she began to inspect her family tree a little closer and realised that her grandma was her husband's grandpa's first cousin.
At this point, the couple confronted their grandparents, who were thankfully still alive, and they confirmed that they are first cousins.
In fact, they'd even lived together when they were growing up.
"We're third cousins!" she said.
As you can imagine, the TikTok went far from unnoticed, and at the time of writing, it's been liked over 87K times.
Viewers were quick to rush to the comments section to share their thoughts.
Reacting to the video, one TikToker questioned: "How did you not realise at the wedding?"
"I think you should have just not told anyone," wrote a second while a third remarked: "So in a way your baby is its own 4th cousin [sic]."
A fourth declared: "3rd cousins not a huge deal, you're good. Hilarious though."
"I like to show how most of the married folks I know are married to their distant cousins," revealed a fifth. "They don't appreciate it as much as I thought they would."
"It was good enough for Queen Elizabeth II," joked a sixth.
"We're all cousins if you go back far enough," said a seventh.
What do you think?
Topics: Sex and Relationships