Tragically twins Rosendo and Rogelio Mendoza have both died on the same day just mere hours apart.

They were just fifty-six-years-old.

The news has been difficult for their family to bear.

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The brothers were very close with each other and they have not been separated ever in their lives.

In the hospital, however, they were put in 2 separate rooms...

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But that still didn't keep them from each other. As heartwarming as this story seems, the ending is tragic, but it emphasizes the love between siblings and especially twins.

Twins are quite simply mesmerizing.

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As a twin myself, I think that we're pretty darn cool. But the likelihood of having twins here in the US is still quite slim, with all pregnant women having approximately the same chance of having identical twins: about 1 in 250.

They share a connection like no other.

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As twins, we don't share your average sibling relationship. Twins and other multiples, like triplets and quadruplets, share an uncanny, somewhat absurd closeness which other people often perceive as "weird" or "strange."

Hundreds of twin studies have been conducted over the years.

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The scientists who’ve run twin studies over the years have learned a lot from identical twins about what kinds of traits — from taste to personality — are genetic. But, surprisingly, they still know very little about the mysterious power of the twin bond.

Science is often the answer to this unbreakable bond.

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Because identical twins come from a single fertilized egg that splits in two, they share virtually the same genetic code. Though there may be minor differences in their personalities, it is more common than not for twins to have an inseparable relationship like no other.

And some put it down to their shared upbringing.

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Because twins tend to share the exact same upbringing and experience the same life experiences and learning curves at the same time as each other (first day of school, et cetera...), some researchers argue that this could explain the close relationship shared amongst twins.

Though I personally think that it's simply magic.

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I don't think that anyone will ever fully crack the twin Da Vinci code, we're far too complex for that.

Though the mysterious twin bond is still very much talked about...

We're always seeing cute twin pictures online, but the remarkable story of one set of twins from Texas has broken our hearts recently.

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As part of the NY Times' "Those We've Lost" series, Rosendo and Rogelio Mendoza's remarkable story was told.

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Ever since they were born in 1964, they were described to be "inseparable," sleeping in the same bed even as adults.

"They would hug each other and scratch each other’s backs," their sister Sandy Mendoza said.

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“That’s how they went to sleep." And even when it came to their jobs, they would always ask a potential employer if they would hire their brother and that's how they've always been.

But things have not been easy for either of them.

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Rosendo was found to have testicular cancer in the 1990s. He was treated for the disease for almost a year at the MD Anderson Cancer Center in Houston and of course, Rogelio went with him.

Due to this early complication, when the pandemic hit, he was more susceptible to COVID-19.

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Because Rogelio also has underlying health conditions that made him vulnerable, the brothers were more careful, but it was almost impossible with the number of cases constantly rising in the area.

Both brothers fell ill around the same time during Thanksgiving.

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The outlet reported that the family said that they did not know how the brothers were exposed to the virus, but that they got sick around the same time with both men coughing and feeling short of breath.

Just a day apart, they were both admitted to the hospital in separate rooms.

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But even that didn't keep them apart. They both had their cellphones, so were constantly on the phone with each other.

However, as their conditions worsened, they had no choice but to be placed on ventilators.

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Rogelio died first at 4:11 AM on December 9th.

Rosendo died that night at 8:30 PM.

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His heart started weakening even though there was some initial hope that he would be able to be taken off the ventilator.

The twins were buried together.

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RIP to the brothers. This is just one of many heartbreaking stories about the horrendous impact that virus has had on our society. As the year comes to a close, we're remembering those that did not make it with the rest of us. Rest in peace.