Grammer was born on February 21, 1955 in Saint Thomas, U.S. Virgin Islands. He was married four times. First to Doreen Alderman from 1982 until they divorced in 1990, they had 1 child. Second to Leigh-Anne Csuhany from 1992 until they divorced a year later in 1993. Third to Camille Donatacci from 1997 until his divorced in 2011, they had 2 children. He has been married to Kayte Walsh since 2011, they have one child.