Paul and Kelly Snisky believe birth order can make a difference in personality.

For example, their 8-year-old son, Cal, is "unafraid to try anything new," Paul Snisky said. "He's really that typical, first-born son, but he's not very helpful, as the oldest."

Paul said his middle child, Jayne, is more of a peacekeeper.

"Jayne is very intuitive and has the pulse on how other people are feeling in the family," he said.

Then there's Aidan, the baby of the Snisky family.

"He's very well-spoken, follows what the bigger kids are doing, thinks he can do it all -- very demanding and very bossy," Kelly Snisky said. "He knows how to get his way."

The theory, according to some experts, is that a person's place in a family's birth order can have a powerful effect, New York City television station WNBC reported.

Meri Wallace, a child and family therapist, is the author of "Birth Order Blues."

"Birth order has a powerful impact on people," Wallace said. "It determines how you feel, how you behave and it affects your relationships. It actually affects the mate that you choose to marry and the job that you choose to do."

Wallace says these are some typical birth order traits:
First child: Self-confident, a perfectionist due to the feeling that their parents watch their every move.
Middle child: Social, good negotiator, may feel left out in the middle position with focus going to the oldest and youngest.
Youngest child: Charming, may feel inferior to the older children.

What does Cal, the oldest Snisky child, think about being the most senior child?

"It's really fun, and sometimes I feel bossy," he said.

According to Paul, "The first one is used to interacting with one, and it's a shock when the new one comes along. Finally, with our third, he's our baby and he has four people running around trying to do what he wants and he enjoys it."

Not everyone agrees on the impact of birth order in a family.

Professor Dalton Conley said it's not a formula. His book, "The Pecking Order -- Why Siblings Succeed And Why" -- looks at a range of factors that may influence how siblings turn out.

"Rich families pour money like it's gasoline onto kids who are doing the worst," Conley said. "They actually use their money to bring the black sheep of the family more or less up to speed. And in the end the kids turn out more or less the same."