who is aunt bethany related to in christmas vacation

Aunt Bethany is the wife of Clark's father's cousin. She's not a blood relative, but she is a close family friend who often spends holidays with the Griswold family. In the movie "Christmas Vacation," Aunt Bethany accidentally sets Clark's Christmas tree on fire while trying to light the fireplace, which causes a chain of unfortunate events that ultimately leads to the demise of Clark's Christmas spirit.