Bernice Matthews is Alan's mother, a high energy person who travels around in a Winnebago. She likes to announce her presense by honking the horn, which plays "La Cucaracha." Every time she shows up to visit, she brings presents to her grandchildren.
Rue McClanahan who portrays Bernice is best known for her roles as Vivian Harmon in The All in the Family spin-off Maude. & Blanche Devereaux in The NBC sitcom The Golden Girls