Who knows the origin of the custom that nephews go to grandma's house on the second day of the first month?

The custom of visiting relatives lasted from the second day of the first month to the sixteenth day of the first month. During this period, almost every family was soaked in alcohol and bathed in fragrance, enjoying the fun of life and family happiness. In the past, I had to wait until the Chinese New Year to go out. There was a saying that "my grandmother was in the third grade, my aunt was in the fourth grade, and I saw my mother-in-law in the fifth and sixth grades"; Now it is the second day of the first month, and the taste of the year is strong. Jiaodong people have opened the curtain of visiting relatives, mostly "seeing their husbands first, then seeing their uncles"; Judging from this evolution, the pace of life is accelerating and the status of women is improving. On the second and third day of the first month, the married daughter returned to her family with her husband and children. The order of visiting relatives is: nephew goes to grandma's house, daughter goes to her parents' house with her husband, and then goes to aunt, aunt and sister's house. Except for special circumstances, we should all go back to worship. There is a folk saying that "the first day and the second day are beautiful, and the third day and the fourth day are good for worship festivals".