Because weddings are pretty much always stressful undertakings that bring families who may have never met together, there's a fairly high risk that some family drama will unfold once the day presents itself.
And the arguments leading up to a wedding can be over everything from money to how they expect guests to dress. But more often than not, they have to do with how those guests will get along.
And while it seems that this final scenario was exactly what one bride was trying to avoid, the demand she made ended up guaranteeing that her wedding would not go smoothly.