Aunt Donna
Donna is Dennis and Deandra Reynolds' maternal aunt. She is Barbara Reynolds' sister, and Frank Reynolds' former sister-in-law. She is portrayed by Nora Dunn.
Season Five
Frank tried to bang Aunt Donna, but she refused: her husband Max recently died, plus Frank was extremely disgusting at the time (also she just might have some moral restrictions as opposed to Frank).
When that failed, Frank briefly considered having sex with Aunt Donna's daughter, Gail the Snail. He received a "handy" from her under the table, but asked her to stop when it turned out that she was mostly "mashing" him.
Mac also had a strong interest in Donna for a while.