The possessive form of the compound noun sister-in-law is sister-in-law's.
Example: My sister-in-law's birthday is the same day as mine.
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The singular possessive form of "son-in-law" is "son-in-law's."
The form "father's in law" is incorrect.The possessive form of the singular, compound noun father in law is father in law's.Example: We completed the project with my father in law's help.
The possessive form of the singular noun attorney-at-law is attorney-at-law's.Example: This attorney-at-law's experience includes representing defendants in criminal cases.
The singular possessive of court is court's.
The possessive singular form of "witness" is "witness's."