John was the son of Angelo Sebastian and Mary D'Orazio. The date and place of his birth have not been found.
His wife was Mary Lou unknown, who he married on ABT 1960. The place has not been found. Their only known child was Angela ().
John P. Sebastian
Angelo Sebastian (c1905-1991)
Mary D'Orazio (c1905-?)
Filippo D'Orazio (c1860-?)
unknown D'Orazio (c1825-?)
Maria unknown (c1860-?)