George and Mary Kahler or Koehler in Ohio

I am seeking information about the family of George and his wife Mary who came to the US from Prussia around 1873. They lived in France until around 1871. George was born in Prussia in 1839.His brother John P. was born in France in 1849.I am a decendant of their daughter Celia. Their children include Celia, 1867; Henry, Mary, George, Wendle, and Ann.