(reproduced from http://www.shaolin.org/video-clips-4/chun-nga-wedding/ceremony-overview.html)
The Night Before the Wedding at the Bridegroom’s Home
On the eve of the wedding, the parents of the Bridegroom thank Heaven and Earth. They then lead by hand their child who is going to be a man to thank the Gods for the blessings.
The hair-combing ceremony signals the transition of the child into a man. The three combings signify that the marriage will be perfect and lasting, that the Bridegroom and the Bride will live long life, and that there will be a lot of children and grandchildren.
The parents then feed the Bridegroom which symbolizes the years of bringing him up from a child into a man. The Bridegroom then offers food to the parents to thank them for bringing him up.