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Yes.
only id he had power of attorney for after he was deceased
No. Since the woman is his widow, he is dead. Dead men cannot marry anyone.
no. because he is deceased
No, it is illegal to marry your sister in Tennessee. Incestuous marriages are prohibited in Tennessee as they are in many states due to the risk of genetic disorders and societal taboos.
This is legal for a man to marry his widow's sister in France.
It is legal for a man in France to marry his widow's sister. These people are not related and there is no problem with marrying.
Your cousin's sister is also your cousin. In some places it is legal to marry your cousin.
A sister in law, by definition, is the sister of your wife. As long as you aren't still married to your wife, it would be legal. A sister-in-law can also be your brother's wife. You can marry her provided she is not still married to your brother.
Yes, it is legal for your sister to marry your husband's brother.
Marriage is a contract. A deceased person does not have the legal capacity to willingly enter into any contracts.
Yes, they are not blood-relatives to one another.