In 1957, Guilfoile married Loretta White in Brooklyn, New York. They became the parents of four children, Ann, Pete, Tom and Kevin, and also enjoyed 10 grandchildren. His son Kevin Guilfoile is a writer who has authored several books, including A Drive Into the Gap,Guilfoile, Kevin (2012). A Drive into the Gap. Field Notes Brand. . which delves into the mystery surrounding the bat that Clemente used for his 3,000th career hit, along with his father's vastly blessed history with baseball and his battle with Alzheimer's disease.OTL: The enduring mystery of Roberto Clemente's bat. Article by Kevin Guilfoile. ESPN.com. Retrieved on July 22, 2016.
