I did some more digging. Your grandmother, Maryann is living with her mother, also named Maryann and her brother, Jacob. I believe Valentine, Sr. is their brother. He is residing a few blocks away while your grandmother is living on Canfield. This was in 1920 and Maryann's mother is a widow.
Your grandparents married May 9, 1911 in Detroit by Fr. Tolka. Witnesses were Jacob Gasior and Stanislau Kozalka. Your great grandfather's name was not Joseph but John.
Katie married Frank J. Michalski on September 26, 1905 in Detroit.
You may want to go to familysearch.org and connect with their US documents. Michigan marriages are there.