Identical Twin Sisters Marry Identical Twin Brothers. Genetically, Their Daughters Are Now Siblings (Exclusive)

Kerissa and Venessa married Jacob and Lucas Sealby, and now they're raising "quaternary siblings" — cousins whose DNA matches like siblings

• When twin sisters Kerissa and Venessa went on their first date with twin brothers Jacob and Lucas Sealby, they instantly connected and paired off into couples

• Venessa and Lucas got married in 2022, and Kerissa and Jacob's nuptials followed in June 2023

• Both couples are now raising daughters, who are biologically considered "quaternary siblings," meaning their DNA resembles that of sisters as opposed to cousins

Identical twin sisters Kerissa and Venessa Sealby have lived their whole lives in tandem, going to college together, living as roommates, running on the same track team and eventually working for the same company in adulthood.

They never expected any overlap in their romantic pursuits, but they also never anticipated meeting twin brothers Jacob and Lucas Sealby.

The two sets of siblings went on their first date in 2020. Venessa was working as a personal trainer, and one of her clients offered to set up her and Kerissa with another pair of sporty twins. Like the sisters, Jacob and Lucas also ran on their collegiate track teams.

As Venessa’s client predicted, the four hit it off right away.

“We met at their house," Venessa recalls to PEOPLE. "We were going to go bowling and decided that we had way too much in common, and we ended up talking all night.”

Venessa and Lucas — who claim to be the more outgoing of their respective sets — connected instantly and became an item.

"As soon as I saw Lucas, I was like, 'Absolutely I am going to marry this guy. He's the cutest person I've ever seen,' " Venessa says. "I was a little nervous for Kerissa because I was like, I hope she starts to feel the same way."

But it didn't take long for the more introverted siblings to follow suit. In fact, the two couples couldn't believe how quickly they fell for each other, and all four were reluctant to confess the depth of their feelings.

"Jacob and Lucas I think knew right away, but they didn't tell us," Venessa says. "How can you love somebody within the first five minutes of knowing each other? But it happens."

Even though they all hit it off, Kerissa tells PEOPLE she’s still hesitant to admit she and her sister have “the same type or taste in men.”

“The boys have very different personalities and, to us, look very different,” Kerissa says.

Today, the two sets of Sealbys — now married and raising kids — have built a big family unit in Oregon, where they live in neighboring homes and spend most of their time as a quartet.

“We see each other every single day, always going over to each other's houses. We do things as couples as well, of course, but most of the time we are doing things together,” Kerissa tells PEOPLE.

It helps that they all have similar interests in sports and the outdoors. The same traits that made the couples compatible as partners have united the four as friends. Their day-to-day consists of hitting the gym, playing pickleball and card games and going out to eat as a group.

Plus, Kerissa says living life as twins has simplified their romantic relationships. Neither couple is worried about splitting up since they’re all well-accustomed to making peace after butting heads.

“I think it’s a twin thing. We get in a conflict, but it’s over and forgotten about in like 2 minutes,” Kerissa tells PEOPLE, adding that arguments have “never [been] an issue” between any of them.

Settled into their parallel lives in the Pacific Northwest, they’re now raising daughters in tandem too. Kerissa and Jacob welcomed baby Sophie in August 2022, and Venessa and Lucas became parents to their daughter Adrian in October of the following year.

Growing up next door to each other, the new generation of Sealbys are already forming a sisterly bond. In fact, while Sophie and Adrian are technically cousins, they’re actually “quaternary siblings,” meaning that genetically, they share DNA like sisters.

The four parents realized this would be the case early on, while Kerissa was expecting her daughter, but she says they still have trouble wrapping their heads around Sophie and Adrian’s biological relationship.

“[We realized] that once Venessa and Lucas had a baby, genetically you wouldn’t be able to tell if I was the mom or if she was and same for the boys,” Kerissa says. “[It’s] very crazy to think about even for us, but we also think it’s pretty cool and unique for them to be ‘sister cousins.' "

But like their sibling parents, the little ones are already developing their own unique personalities. So far, Kerissa tells PEOPLE, 6-month-old Adrian is "a lot more of a go-go-go baby” and 20-month-old Sophie has been “very calm, goofy and smart.”

As they grow up and evolve as individuals, Kerissa hopes her daughter and niece will maintain “a bond as strong as all of ours.” And pretty soon, they may be adding more quaternary siblings to the Sealby brood.

Both Venessa and Kerissa have always wanted a big family with many kids, and looking ahead, they’re hoping to sync up their timelines.

“We do want them all to be close in age,” Kerissa says of their future kids. “We are thinking about having at least one pregnancy together!”

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