Receiving lines have always been a much-debated addition to ceremonies and receptions, but they have been proven to be very useful. Whenever people come to your wedding you want to make sure they feel important. Receiving lines give guests the pleasure of physically congratulating you and your family without feeling like they are intruding while you are trying to enjoy yourself at the reception. I typically advise couples to only include immediate family members since wedding guests are looking to congratulate the happy couple and their parents, not the entire bridal party. As always, it is completely up to the couple.
The order of receiving lines is as follows:
Mother of the Bride
Father of the Bride (optional)
Bride
Groom
Mother of the Groom
Father of the Groom (optional)
Bridesmaids and Groomsmen (optional)

