The first day of Tết is reserved for the nuclear family. Children receive red envelopes containing money from their elders. This tradition is called "mừng tuổi" (happy new age) in the North region and "lì xì" in the South region. Usually, children wear their new clothes and give their elders the traditional Tết greetings before receiving money. Since the Vietnamese believe that the first visitor who a family receives in the year determines their fortune for the entire year, people never enter any house on the first day without being invited first. The action of being the first person to enter a house at Tết is called "xông đất", "xông nhà", or "đạp đất", which is one of the most important rituals during Tết. According to Vietnamese tradition, if good things come to a family on the first day of the lunar New Year, the entire following year will also be full of blessings. Usually, a person of good temper, morality, and success will be a lucky sign for the host family and be first invited into his house. However, just to be safe, the owner of the house will leave the house a few minutes before midnight and come back just as the clock strikes midnight to prevent anyone else entering the house first who might potentially bring any unfortunate events in the new year, to the household.