The sons of Lotan were Hori and Homam; ¹  Lotan’s sister was Timna.

The sons of Lotan: Hori and Homam. (Timna was Lotan’s sister.) ¹ 

Now Zillah also gave birth to Tubal-Cain, who heated metal and shaped ¹  all kinds of tools made of bronze and iron. The sister of Tubal-Cain was Naamah.

You must not expose the nakedness of your mother’s sister and your father’s sister, for such a person has laid bare his own close relative. ¹  They must bear their punishment for iniquity. ² 

You are the daughter of your mother, who detested her husband and her sons, and you are the sister of your sisters who detested their husbands and their sons. Your mother was a Hittite and your father an Amorite.