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
While the United States holiday was adopted by some other countries, existing celebrations, held on different dates, honouring motherhood have become described as "Mother's Day", such as Mothering Sunday in the United Kingdom or, in Greece, the Eastern Orthodox celebration of the presentation of Jesus Christ to the temple (2 February of Julian Calendar). Both the secular and religious Mother Day are present in Greece. Mothering Sunday is often referred to as "Mother's Day" even though it is an unrelated celebration.