I find it interesting that your grandfather's name is Alton Denslow, and that you are looking for a New York Denslow. My grandfather's name is Louis Alton Denslow, and he was born in Jamestown, NY, in 1910. He almost always used the name Alton, because his father's name was Louis Alton Denslow (1881) as well. I haven't heard about a Philander, but unless Alton used to be a very common name, it has to more than a coincidence that we are both related to Alton Denslows from upstate NY.
Thomas Alton Valois, Son of Judith Grace (Denslow) Valois, Grandson of L. Alton Denslow (Jamestown NY) & Grace (Mosley) Denslow, Great-Grandson of Louis A. Denslow & Lena (Eselhorst) Denslow, Great-Great-Grandson of Willard Tracy Denslow & Laura Jane (Smiley) Denslow, Great-Great-Great-Grandson of (I believe but I am not sure) Jeremiah Denslow & Barbara (Griffith) Denslow