A worried sibling says their sister simply cannot wait to marry her fiancé and start a family together and is furthermore delighted that their identical surnames mean she won't have to go through the hassle of changing her name.
Although this coincidence certainly means less paperwork for her sister, the sibling fears it could also mean they're related by blood, and has urged them to get a DNA test, just in case.
The two families are understood to live in a rural area with a "history of polygamy and large families", a factor that has only added to their anxieties.
This individual has previously voiced their apprehensions when the couple first began dating more than a year ago and decided to once again push for a DNA test during a recent family dinner. Unfortunately, this suggestion didn't exactly go down well with everyone.
Taking to Reddit, the concerned person wrote: "At our most recent family get-together, I suggested (not for the first time) that they get a DNA test to make sure they aren't related.
"At first, no one said anything and everyone just sat in awkward silence. Then my dad chimed in and said, 'We can just wait until the babies come out, and see if they are cross-eyed or not'.
"I laughed at his joke, and my sister said that our last name is one of the most common last names in the state. It's not, but it is a common last name.
"I said that they still should check to be sure. At this point, she told me to shut the f*** up and the conversation was over because nobody wants to deal with her. The wedding is in less than three months, and she wants a baby yesterday."
They now wonder whether they should have just kept their suggestion to themselves, and have reached out to fellow Reddit users for advice.
A number of people felt that they should back off and leave this very personal decision to their sister, who many felt deserved an apology.
One person commented: "You're nagging her about something that's none of your business and you're not backing off when asked to do so.
"They can't be that closely related, if they're related at all, or older family members would have spotted the crossover. It's a common surname, and honestly, sharing great-great-great grandpa generations ago isn't a concern. Stop pestering your poor sister and obsessing over her potential child's genetics."
Another remarked: "That joke your dad made about the kids? That was him trying to smooth over and past your unwelcome and rude comment. Rude because it's none of your business and as you'd already mentioned, knew they aren't interested.
"But you wouldn't take the lifeline. The conversation didn't end because 'nobody wants to deal with her'. It ended because of you. You made it awkward and uncomfortable."
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