<p>The situation, Thankfully, has never come up. My father did pass on a Saturday, but it was on an off weekend. My wife knows where I am and that I don't / won't answer a phone during a wedding. </p>
<p>If one of my kids was ill, injured, etc.. I probably would leave to be at their side. </p>
<p>The only other excuse for leaving is something happening to the wedding party, couple or wedding venue. </p>