Of course, you can have similarities to your mates. But when do you start to question whether you might actually be related?
Well, two identical-looking athletes with the same name decided to take a DNA test to see whether they are secretly long-lost siblings.
Brady Feigl is a 6'4 baseball player with red hair, a red beard and thick glasses, and remarkably there is another Brady Feigl who is also a 6'4 baseball player with red hair, a red beard and thick glasses.
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So you can see why the pair were questioning things.
One of them is a pitcher for the Pericos de Puebla in Mexico, while the other was a pitcher for the Oakland Athletics.
I mean they even play in the same position.
Of course, people have told the two pitchers over the years about their similarities, so much so the two Bradys wanted answers.
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And to many people's surprise, a DNA test revealed the pair aren't actually related after all.
While the DNA test may have confirmed they are not long-lost siblings, it did provide one similarity.
The athletes' level of Germanic ancestry was identical as they both registered as 53 percent Germanic in origin.
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That was the only similarity however, as the pair were different on every other measure, subsequently confirming they are not long-lost siblings after all.
A new family may not be on the cards for the two Bradys, but they are glad to have met each other and said they were 'still brothers in a way'.
Perhaps one of the most amazing stories involving long-lost twins involves Jim Lewis and Jim Springer.
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The pair, who have also become known as the 'Jim twins' in recent years, have some astonishing similarities.
The name is an obvious first similarity, with their respective adopted parents seemingly liking the name Jim.
Both Jims had married twice - with both of them going on to marry a woman called Linda.
Things didn't work out for either with Linda so the two Jims each met a woman called Betty.
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The two men also discovered they had the same taste in beer and preferred to smoke the same brand of cigarettes.
Thankfully, there were some differences as one twin ended up getting married a third time to a woman named Sandy, something not emulated by the other Jim.
At the age of 39, the Jim Twins were finally reunited in February 1979.
Topics: US News