Respuesta :

RavenclawVD

Answer:

her sister-in-law's

Explanation:

The possessive cannot be 'sister's-in-law'; it has to be "sister-in-law's", and that is what native speakers say and write.

e.g. The house of her sister-in-law is her sister-in-law's house.

It's her sister-in-law's.
If we had to say the possessive form of passer-by it won't be passer-bys, but passers-by
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