Spouse's sibling's wife.
My co-sister-in-law is a good person.
Spouse's half-sibling's wife.
My half-co-sister-in-law is a good person.
half-co-sister-in-law.
Spouse's stepsibling's wife.
My step-co-sister-in-law is a good person.
step-co-sister-in-law.
The wife of one's spouse's brother.
co-sister-in-law.
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