A Utah woman finds out she accidentally married her cousin while pregnant with his baby.
Shocked mother Marcella Hill shared the crazy revelation on TikTok, which went viral in the process.
While browsing the web for baby names, the 41-year-old and her husband were sat on the couch having a look on FamilySearch to see what they could find.
Bizarrely, the pair noticed something strange about the name of their grandparents and great grandparents.
"So I've never publicly told anyone but I accidentally married my cousin," the TikToker said.
"I was sitting on the couch looking for names for the baby that we were about to have and I was on [genealogy site] FamilySearch.
"Husband's next to me on his own FamilySearch and he's like, 'Oh that's funny, we have the same grandma and grandpa's names'.
"I look at this line and it's all the same as mine. So I think, 'Oh no no, you're still logged into my account'.
"Then we start looking at it and we realise my grandpa is his grandma's first cousin."
After getting on the phone to their respective grandparents, the couple were informed that they actually have the same great-great-grandparents.
"Sure enough, sure do. They lived together when they were growing up as children," Marcella said of their great grandparents.
"We (Marcella and her husband) are third cousins.
"And when I go to my family reunion, he gets to go to his too at the same time."
Viewers were quite shocked by the revelation as one person commented: "How didn't y'all realise this at the wedding?"
Another joked: "So in a way your baby is it’s own 4th cousin.
"3rd cousins not a huge deal, you’re good. hilarious though," a third said.
While someone else suggested: "I think you should have just not told anyone."
"Say you’re from Utah without saying you’re from Utah," another joked.
In the US, second cousins are legally allowed to marry in every state.
However, marriage between first cousins is legal in only about half of the American states.
According to Utah State Legislation, it is illegal for first cousins to marry unless the couple are both 65 or over with a district court finding that either party cannot have children.
Marcella explained how she came to be married to her cousin in another TikTok video.
"We got married at a courthouse after work on a Wednesday," she said.
She continued: 'Let's say we had the wedding, and my grandpa and his grandma were there, and we found out that we were third cousins at the wedding, what were supposed to do?'