The last couple of Parashot dealt with members of Abraham's family, both Abraham and Nachor's descendants. As far as I can see, many of them, both righteous and wicked, were liers: it starts with Abraham fooling Pharao, continues with Itzhak repeating the same trick, then Rivka and Yaakov deceiving Isaac, then Lavan, and finally Rachel and Leah plotted against Yaakov, this continues with Yaakov's sons that fooled Shechem's residents as well as their father.
I saw interpreters explaining some lies as a countermeasure of the Tzadikim against the wicked, but most of those are not.
Off the top of my head, I don't recall other Biblical characters of the book of Genesis (Pharaohs, Avimelech, Malkitzedek, Shechem, Chamor, Efron, etc) being so deceptive, at least in the plain text.
Do commentators address why those qualities, in the Biblical narrative, are intrinsic to Terah's descendants?