How To Draw A Dappled Horse How Do You Draw Marriage Lines On A Family Tree When Two Siblings Married Two Siblings In The Same Family?

How do you draw marriage lines on a family tree when two siblings married two siblings in the same family? - how to draw a dappled horse

I mean, my father and his brother married my mother and my aunt (who are also sisters). As the line is drawn for the marriage? Does anyone give an example? I can not find a way to do this together without crossing the lines ...