Given that the hazard is imprisonment and social exclusion for you both, and the risk of such penalty is very high, I would say it is not at all safe.
In fact it's illegal in, probably, all countries of the world! A fully step-sister, perhaps, but even that might be fraught with difficulties.
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.
yes you can marry because she is your cosin sister
Yes, if his wife is dead or divorced he could marry her sister.
Yes. You can marry your LIVE wife's sister if you want to, provided that you are both free to marry.
Your cousin's sister is also your cousin. In some places it is legal to marry your cousin.
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This is legal for a man to marry his widow's sister in France.
Yes, they did marry.
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.
it is safe to marry a person with sickle cell, provided that you are not a career of the trait.
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.
You can marry your sister in law in Georgia. The law only addresses marrying close relatives and your wife's sister would not fall into that category.