Thematic Bible: Illegitimate, and therefore not entitled to inherit his father's property

Now Jephthah the Gileadite was a mighty warrior, but he was the son of a harlot. Gilead was Jephthah's father. And Gilead's wife also bore him sons, and when his wife's sons grew up, they thrust Jephthah out and said to him, You shall not have an inheritance in our father's house, for you are the son of another woman.