Yes. The term "sister-in-law" is used for two types of relationships:
Some languages may have some different terms for these two cases, but in English they're both "sister-in-law".
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Technically no because its like when your wife dies there is no need for divorce to remarry. So no your deceased wife's sister is not your sister in law legally. But also family is family no madder how distant.
Yes. Just like when your mom married your dad, any siblings he may have, become your mother's in-laws and your aunts or uncles.
Your husband's sister is your sister-in-law. If your husband has a brother the brother is your brother-in-law