Please speak in the ears of all the men of Shechem, Whether is better for you, that all the sons of Jerubbaal, who are seventy persons, rule over you, or that one rule over you? Remember also that I am your bone and your flesh.
Evidently Abimelech felt that Gideon’s other sons were ambitious to be king too, though there is no indication in the text that any of them felt this way. He was perhaps projecting his feelings on them, as is often true of ambitious people. They sometimes become paranoid, as Abimelech did (cf. King Saul).