The purpose of a traditional receiving line is to allow the newlyweds, their parents and other members of the bridal party to personally welcome the guests to the wedding. With modern family dynamics now including divorced parents, ex-partners, etc it can make the logistics of who stands where in the receiving line complicated. Put this alongside the fact that receiving lines can be quite time-consuming, and some guests balk at having to stand in line waiting to greet the happy couple, and...