Patti Miller (1954 - 2019) was the mother of Phil and Mike Miller, and wife of the late Reb Miller. She is also the grandmother of Phil's daughters Bezequille & Mike Miller,
Her first appearance was in a flashback celebrating Phil's birthday in "Alive in Tucson".
After Phil and Mike get into a prank-war, she is heard in a voice-over sequence when Mike reads a fake letter from her written by Phil in "Fourth Finger".
Her grave is seen in "30 Years of Science Down the Tubes", where Phil reveals to Mike that he had buried her alongside her husband in their backyard.
She is portrayed by Patti Forte, the real mother of creator, producer and writer, Will Forte.