Haas family of Auburn NY

I am seeking information on the German roots of my grandfather, Adolph Haas. He came to the U.S. in 1895 and settled in Auburn NY with his sisters, Pauline, Emily, and Mary. I have information that they came from Freudenstadt, Germany, where several siblings continued to live. Census information indicated that Adolph and his wife, Mary Louise Fuchs, set sail from Stuttgart. There is a family story that two brothers came to the U.S. and settled in the midwest. I would appreciate information on the Haas family of the Freudenstadt area of Germany.