I had invited A all my sister in law rsquo s B to my son 39 s birthday party C No error D ........

English ( Master) Nouns

I had invited(A)/all my sister-in-law’s(B)/to my son's birthday party. (C)/No error(D)

Here ‘sister’ is the root word and we make plural of root word hence we use ‘sisters-in-law’.

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