Abraham Jebediah Simpson I is the ancestor of Homer Simpson, Bart Simpson, Lisa Simpson and Maggie Simpson. The son of Mabel Simpson and Virgil Simpson, and the maternal half-brother of Eliza Simpson.
Abraham was indefinitely named after Abraham Lincoln, the 16th President of the United States, who directly helped Virgil and Mabel escape from slaveholders pursuing them. He was born after Mabel and Virgil married in Canada, and is briefly seen in the episode wearing Lincoln's tall hat, which had been given by Lincoln. Abraham is also the great-grandfather of Abraham "Grampa" Simpson and presumably his namesake. Grampa mentioned that he and his wife tried to make a cure for holy water but made a sex tonic instead.. Abraham is also half Black due to the fact that his Father, Virgil Simpson is Black.
- Abraham looks like Bart, although he has longer hair.