What is the meaning of "back to the door" in the wedding banquet.

Back to the door: the old Han Chinese marriage customs. That is, after the marriage of three, six, seven, nine, ten days or full moon, son-in-law with gifts, with the bride back to the mother's home, worship scorpion wife's parents and relatives. The son-in-law's rite of passage, which began with the welcome of the bride, is now complete. This custom began in ancient times, generally known as the "return to the Ning", for the meaning of home to visit their parents after marriage. In later times, the name of the ceremony varied from place to place. In the Song Dynasty, it was called "Baimen"; in the Qing Dynasty, it was called "Shuanghuimen" in the north, "Huijin" in the south, "Wushang" in some areas of Hebei, "Wake Auntie" in Hangzhou, and "Wushu" in the south. In some areas of Hebei, it is called "calling aunt", and in Hangzhou, it is called "returning to the groom". Modern Tongbao on the third day after the wedding, also known as the "three dynasties back to the door". This is the last ceremony of the wedding, there are daughters do not forget the gift of parenting, son-in-law to thank the parents-in-law and the newlyweds love and beauty and other significance, in general, the female family have set up a banquet, the new son-in-law into the seat, accompanied by the female clan elders to drink. The newlyweds or return on the same day, or stay for a few days, if they stay, they do not stay in the same room.