Is it called rape if a brother has sex with his own sister?

Nonen0ne Updated Answer
It is incest and illegal. Depending on the ages, it could be statutory rape. And if the sister did not consent it would be rape as well as incest.
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What is your sister-in-law called after your brother dies?

After your brother dies, his wife is still your sister-in-law. If she remarries, you or she may find it convenient to think of her as your former sister-in-law.

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