Aunt Effie Harper is Thelma Harper's sister-in-law. Originally, she was named "Effie Crowley" and she was referred to as "Cousin Effie". Effie is generally considered to be crazy, and she provides a good laugh with her antics and ever-present rum balls. It is never mentioned how old she is but Vint once remarked. “Why Aunt Effie, she’s three days older than God!” She first appears in the season one episode "Vint and Naomi's Wedding".
She was portrayed by Dorothy Van.