A couple in Dallas, Texas, managed to have two sets of identical twins -- a feat that is rarely accomplished.

Brian and Kelsey Lewis are parents of four boys -- two sets of identical twins -- born only 13 months apart.

The chances of a mother giving birth to two sets of identical twins might only happen between one in 11 million to one in 35 million times.

"Oh yea, we've won," Mr. Lewis said. "We won twice. We've won the lottery two times," he told the Dallas-Fort Worth ABC affiliate.
             
The couple did not use fertility drugs and say they would even like to have a third set.  

"Yea, we're going to try for another set," Mr. Lewis said. "We're serious. We think that would be pretty awesome."

"Maybe girls next time," Mrs. Lewis said.