DEAR ABBY: My parents went through a bitter divorce five years ago and have had little to no contact since then. During the process of the divorce, their communication was through my siblings and me, which took a toll on us. However, despite the turmoil of the divorce, we are still close to both of them. I’m a medical student who will be graduating next year. I recently brought up the idea of having a graduation party, but my father says he refuses to come if Mom or anyone from her side of the family will be there. This led ...