Kessler Family, originally from Czech Republic

I am searching for my grandfather's family, who originally came from the Czech Republic and moved to Michigan when my grandfather was young. My great-grandparents were Johann (John) and Maria Kessler. My grandfather was also Johann and he had a brother that was nicknamed Chester, I think. My dad met his cousin, while stationed in the army, in Germany. The family still lived in Michigan as far as I know. If anyone is familiar with this family, please let me know.