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half-co-sister-in-law 

Spouse's half-sibling's wife.
half-co-sister-in-law.

step-co-sister-in-law 

Spouse's stepsibling's wife.
step-co-sister-in-law.

Sister in Lawrence

What you say when you meet another Eddie stan who loves him as much as you!!!
Person 1: "So you would die for eddie?"
Person 2: "Duh!!! I have him on my arm!"
Person 1: "Youre my sister in lawrence!!"