Ropp said it also improves motor skills and teaches children to develop a sense of space.
"It's really hard with spoken words to tell somebody where to find something. But with sign language, you use that spatial orientation that allows you to pinpoint exactly where that thing is," Ropp said.
Ropp, whose younger brother is deaf, said she always wanted her children to learn sign language.
But she had a hard time finding a sign language class close by.
"I was surprised that it's hard to find a class in the area," Ropp said.