What does Judges 9:1 mean?

Abimelech, son of Jerubbaal, went to his mother’s relatives in Shechem and said, 'Ask all the leaders of Shechem: Which is better for you—that all seventy of Jerubbaal’s sons rule over you, or just one man? Remember, I’m your own flesh and blood.' Judges 9:1 - Modern Text Bible

(Abimelech tries to win support from his mother’s family, arguing that it’s better for them if he alone rules, since he’s one of them.)