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The likelihood of having identical twin babies is extremely low. Such pregnancies are estimated to only occur about 0.45 percent of the time, or once in every 250 pregnancies.
As such, it doesn't take a genius to figure out that the probability of an identical twin having identical twins is unbelievably tiny.
But lightning has struck twice in the Gochitashvili family.
Giorgi and Gela are 25-year-old identical twins from Tbilisi, Georgia, and they welcomed a new generation of identical twins into the family five months ago.
To clarify, they both welcomed them, but Gela made them with his wife Elena.
And as if the babies weren't similar enough, the couple decided to name their daughters Marita and Anita.
Speaking to LADbible, Alison Pike, Professor of Child and Family Psychology at the University of Sussex, explained just how unlikely it was for Gela to father identical twins of his own.
She said: "Unlike fraternal twins, identical twins do not run in families. Thus, it is pure coincidence when an identical twin goes on to have identical twins themselves.
"The chances of an identical twin having an identical twin can thus be calculated in the same way as calculating the odds of particular gender constellations. So, as an example, the odds of having boy-boy siblings is 1/2 multiplied by 1/2, equalling 1/4.
"The chances of having identical twins are one in 250 births. So, the identical twin parenting identical twin odds are 1/250 multiplied by 1/250, equalling 1/62,500 births."
Of course, having an identical twin in itself is a unique life experience that can only really be appreciated if you have one of your own. As such, the brothers are confident that their extremely unusual family dynamic could help out Marita and Anita - though raising twins is still not going to be easy.
Speaking to LADbible, Gela said: "We like to be identical because it's great when you are special, and I hope my babies will also be happy about that when they realise.
"We have experience being twins and our mother was always telling stories about how hard it was to raise twins and all the details she learned through practice. But this experience doesn't mean that raising twins would be easy for someone, because it's very hard."
Uncle Giorgi agreed that being an identical twin is cool.
He said: "We know all the twin things so we will help them.
"It's cool to be an identical twin because you're strong. Everybody gets attention - you're popular - and it's easy to do some things."
As for dressing the girls the same, Giorgi said it's par for the course.
He said: "I remember throughout our childhood, me and Gela were wearing the [same] clothes and it was annoying then for us. We didn't like the attention in the streets or in school, but then we understood that it was cool.
"After the ages of 10 to 12, we didn't wear the same clothes. So it's like that in the babies' case - while they are small, let the parents decide, then they will be themselves."
The brothers both already have older daughters. Gela has a six-year-old, named Taisia, while Giorgi has a five-year-old daughter called Sesili. For this reason, the pair were quietly hoping for a boy during Elena's pregnancy.
But Giorgi said he and his brother were delighted with the twin sisters.
He said: "We thought one of them might be the boy we wanted, but they are the most beautiful and loveliest girls, so we're both happy."
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