John Gill Commentary Leviticus 18:12

"Thou shalt not uncover the nakedness of thy father`s sister: she is thy father`s near kinswoman." — Leviticus 18:12 (ASV)

You shall not uncover the nakedness of your father's sister ,
&c.] His aunt by his father's side, an instance of which we have in Amram, (Exodus 6:20) ; and Maimonides says ^F9 , an aunt was forbidden whether she was a father's sister in lawful wedlock or in fornication: she [is] your father's near kinswoman ;
or, the rest of your father ^F11 ; the residue of his flesh, one of the same flesh and blood with him; wherefore, as he could not marry her himself, so his son likewise was too near akin to enter into such a relation with her.

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FOOTNOTES:

• F9: Hilchot Issure Biah, c. 2. sect. 5.
• F11: (Kyba rav) "reliquiarum patris tui", Tigurine version.