Halakhah su Levitico 18:14

The nakedness of the brother of your father you shall not reveal: To not have intercourse with the brother of the father. And it is from what appears that there is no difference whether he is the brother of his father from the father or from the mother, whether he is from marriage or whether from licentiousness; as it stated (Leviticus 18:14), "The nakedness of the brother of your father you shall not reveal" - and he is called the brother of his father regardless. And even though [a man] who has intercourse with any male is liable on account of "and with a male you shall not lay, etc.," this negative commandment is in addition [to that] for the one that has intercourse with the brother of his father. And if he was inadvertent, he is liable for two sin-offerings - on account of the negative commandment of the one who has intercourse with the male, and [on account of] the negative commandment of one who has intercourse with the brother of his father - and as we said also with his father (Sefer HaChinukh 189). And in the Gemara Sanhedrin 54a, they, may their memory be blessed, said, [that] one who has intercourse with the brother of his father is liable for two, according to the words of all.

The nakedness of the wife of the brother of your father, you shall not reveal: Not to have intercourse with the wife of the brother of your father. And this one is called his aunt (dodah) in Scripture, since she is the wife of his uncle (dod), as it is stated (Leviticus 18:14), "to his wife you shall not approach, she is your aunt (dodah)." And this warning is from when she was betrothed to his uncle - meaning to say, she was designated for him - and there is no need to say, after she married him. And [this is the case] whether [it is] in the lifetime of his uncle and even after he divorced her, or whether after his death (Yevamot 97a).