In fact when a "father's day" was first proposed there were no Father's Day cards!
Mrs. John B. Dodd, of Washington, first proposed the idea of a "father's day" in 1909. Mrs. Dodd wanted a special day to honor her father, William Smart. William Smart, a Civil War veteran, was widowed when his wife (Mrs. Dodd's mother) died in childbirth with their sixth child. Mr. Smart was left to raise the newborn and his other five children by himself on a rural farm in eastern Washington state. It was after Mrs. Dodd became an adult that she realized the strength and selflessness her father had shown in raising his children as a single parent.
At about the same time in various towns and cities across American other people were beginning to celebrate a "father's day."
In 1924 President Calvin Coolidge supported the idea of a national Father's Day. Finally in 1966 President Lyndon Johnson signed a presidential proclamation declaring the 3rd Sunday of June as Father's Day.
Father's Day has
become a day to not only honor your father, but
all men who act as a father figure. Stepfathers,
uncles, grandfathers, and adult male friends are
all honored on Father's Day.
( Courtesy: http://www.holidays.net/father/ )