Wedding planning is stressful (and fun!) But one aspect that can too often cause unnecessary anxiety is determining the size of one’s wedding party. Part of the reason the party selection is so fraught is that tradition can play a pretty big role in the process. On top of that, the traditions seem to change depending on what part of the country in which you are getting married. For instance,  southern brides are expected to include their future sister(s)-in-law and it’s not uncommon...