I have been told that anyone with the last name Hileski is related to me. My father was Michael Carl Hileski, born in Allegan, Michigan, in 1946, son of Aurel Hileski, who died in the 1980s (sorry, don't remember exact date). He had several brothers and sister, one brother named Bobby, one sister named Cecelia (I think). Aunt Cecelia named in the late 1980s. I'm not sure about Uncle Bobby.
If the family is one and the same, what I was told was that my great grandfather immigrated as an infant from Poland, and the name use to be Chiluski (not sure if that is the correct spelling).
My Dad broke off from the family when he left home, so we lost a lot of info. If this sounds like the right family, I can ask my Mom for more information and maybe some contacts. I think she still has some.