Mahlon Stanley was the brother to my grandfather, Abraham Augustus("Abe", m. Mary Ella Coller), who son, Mahlon A.("Mal", m. Vera Sofie Martens) was my father. We are, of course, cousins! Your g.g.grandfather was known as "Uncle Mahlon" by my father and his cousin, Chester A., whose father was John Albert(m.Mary), and older brother to Mahlon Stanley.
I am still searching for earlier Garis roots. Please feel free to contact me.