If the Pete and Agnes Sinkiewicz family is the one you are looking for, they lived in Otsego Lake Township. You can find them in 1920 Census on the first page for the township, dwelling # 92. The 1930 census has them on the first page of the township at dwelling #6. Children are Annie, Vera, William, Stanley, and Frances. If this is who you are looking for let me know. I can give you a little more information. The family was known as Sink