Schwendtner, a thespian at heart who performed for the disabled, and Prem, who learned to speak English at age 5 by watching cartoons, both died in the accident on the Delaware River.
They drowned when a tugboat operated by K-Sea Transportation of New Brunswick, N.J., pushed a 250-foot, city-owned sludge barge into the back of the Ride the Ducks boat filled with 37 passengers, including a contingent from Mosonmagyarovar, Hungary.
The other 35 people survived the crash, which is under investigation by the National Transportation Safety Board.
Ride the Ducks is owned by Herschend Family Entertainment Co., of Norcross, Ga.
Mongeluzzi said his firm, Saltz Mongeluzzi Barrett & Bendesky, has handled about 50 loss-of-life cases, but "the death of a child is a very different thing. It is devastating."
"It is a wound from which no parent can ever fully heal," he added.
Duffy and Mongeluzzi were en route last night to Vienna, Austria, which is a 45-minute drive to Mosonmagyarovar, population 32,000, where the Schwendtners live. The Prem family lives 15 minutes away in the tiny village of Yanos Somorja, population 300, Ronai said.
Mongeluzzi also represented victims in the Pier 34 collapse that killed three women on the Delaware River in May 2000, and in the Tropicana Casino Resort parking-garage collapse, which resulted in four deaths and 24 injuries in October 2003.
Mongeluzzi said families don't think about money in most cases when there's loss of life.
"They want to know how can this happen? Why did it happen? How can we prevent this from happening again?" he said yesterday from his Liberty Place office with a bird's-eye view of the Delaware River.
"Clearly, these families suffered the most devastating of all losses," he said of the Prems and Schwendtners.
Mongeluzzi and Duffy asked the public to contact them if they have any images, videos or information from the day of the crash.
People close to Dora's mother have set up a post-office box for her so that those in Philadelphia can send her correspondence. Anyone can send letters - no money - to Aniko Takacsne, Box 9201-PF 157, Mosonmagyarovar, Hungary.