'Ancestor's' in the Bible

“The words of Jonadab, son of Rechab, have been carried out. He commanded his sons not to drink wine, and they have not drunk to this very day because they have obeyed their ancestor’s command. But I have spoken to you time and time again, and you have not obeyed Me!

Yes, the sons of Jonadab son of Rechab carried out their ancestor’s command he gave them, but these people have not obeyed Me.