While Mother's Day is an American development that falls on the second Sunday of May, Mothering Sunday is an English development that falls on the fourth Sunday in the month of Lent. In Christianity, Lent is 40 days before Easter in which people engage in fasting, and abstain from consuming certain foods and partaking in festivities. Nevertheless, both days are dedicated to mothers to thank them for their invaluable love and affection. Also, you can bag Mother's Day flights regardless. Just saying.