Mother's Day dates back to ancient cultures in Greece and Rome. In both cultures, mother goddesses (Queen of Heaven). were worshipped during the springtime with religious festivals. The ancient Greeks paid tribute to the powerful goddess Rhea, the wife of Cronus, known as the Mother of the Gods (Queen of Heaven). Similarly, evidence of a three-day Roman festival in Mid-March called Hilaria, to honor the Roman goddess Magna Mater, or Great Mother, dates back to 250 BCE.
As Christianity spread throughout Europe, the celebration of the "Mother Church" replaced the pagan tradition of honoring mythological goddesses. The fourth Sunday in Lent (Weeping for Tammuz), a 40-day fasting period before Easter, became known as Mothering Sunday. To show appreciation for their mothers, they often brought gifts or a "mothering cake" (Jeremiah 7:18) and over time, it began to coincide with the celebration of the Mother Church. Mother's Day always falls on the second Sun-day of May, and like so many other holidays rooted in pagan sun-worship including Father's Day which always falls on the third Sun-day of June, usually fall on the day named in honor of their most powerful god -- The Sun!
Exo 20:12 Honour thy father and thy mother: that thy days may be long upon the land which the LORD thy God giveth thee. You have to honor your parents all the days of your life. Not just one day a year.