Do parents love their first-born more?

"There was no observable preference for the first or second child," Diane Putnick, a study co-author a developmental psychologist at the NIH tells Inverse. Mothers engaged in 15 percent more play with older children, and younger siblings received roughly four percent more praise and 9 percent more physical affection.

Read more

Moreover, which child is usually the most successful?

First-born kids tend to be leaders, like CEOS and founders, and are more likely to achieve traditional success. Middle-born children often embody a mix of the traits of older and younger siblings, and they're very relationship-focused. What's it like losing a twin? Twins literally do not know how to exist as one. When a twin dies, the twinless twin longs to reconnect. The twinless twin may have phantom pain or feel half dead. He or she may feel a need to represent both him or herself and the deceased twin or may even take on behaviors of the deceased twin.

Consequently, why are twins so close?

Identical twins share a particularly intense bond. They are the result of one fertilized egg splitting into two, giving them identical DNA. (Fraternal twins are the result of two separate, genetically different fertilized eggs.) As a result, identical twins are as close as two people can be. Thereof, is it true that twins feel the same pain? Similar to the mind-reading myth, there are things that can't be explained. There are twins who say they have felt each other's pain. And their close relationship and nearly-identical physical structure means there could be a sliver of truth in the theory - as pain can be psychological and can be felt empathetically.

Do twin brothers get along?

Even fraternal twins - twins that developed from two different eggs fertilized by two different sperm - have a close connection. "Fraternal twins, though, are two genetically unique beings, as if you had two regular siblings just at the same time, and they, again, oftentimes have a close connection," Healy says.