Father's Day
Father's Day was not celebrated in the US, outside Catholic traditions, until the 20th century. As a civic celebration in the US, it was inaugurated in the early 20th century to complement Mother's Day by celebrating fathers and male parenting.
After Anna Jarvis' successful promotion of Mother's Day in Grafton, West Virginia, the first observance of a "Father's Day" was held on July 5, 1908, in Fairmont, West Virginia, in the Williams Memorial Methodist Episcopal Church South, now known as Central United Methodist Church. Grace Golden Clayton was mourning the loss of her father, when in December 1907, the Monongah Mining Disaster in nearby Monongah killed 361 men, 250 of them fathers, leaving around a thousand fatherless children. Clayton suggested that her pastor Robert Thomas Webb honor all those fathers.
Mother's Day (United States)
On May 10, 1913, the U.S. House of Representatives passed a resolution calling on all federal government officials (from the president down) to wear a white carnation the following day in observance of Mother's Day. On May 8, 1914, the U.S. Congress passed a law designating the second Sunday in May as Mother's Day and requesting a proclamation. The next day, President Woodrow Wilson issued a proclamation declaring the first national Mother's Day as a day for American citizens to show the flag in honor of those mothers whose sons had died in war. In 1934, U.S. President Franklin D. Roosevelt approved a stamp commemorating the holiday.