Abraham Simpson II

Abraham Jedediah Simpson II, also known as "Grifty McGrift" and commonly known as "Grampa Simpson", or simply as "Grampa", (voiced by Dan Castellaneta) is the patriarch of the Simpson family, the father of Homer, Herbert and Abbie Simpson, father-in-law of Marge Simpson, and the paternal grandfather of Bart, Lisa, and Maggie Simpson. He is also the ex-boyfriend of Jacqueline Bouvier, his daughter-in-law's mother.

Abe is a World War II veteran who was later sent to the Springfield Retirement Castle by Homer. He is known for his long, rambling, and often inaccurate stories and general incompetence.