step-son ,step-mother ,step-brother ,sister-in-law ,parent-in-law变为复数

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step-son,step-mother,step-brother,sister-in-law,parent-in-law变为复数step-son,step-mother,step-brother,s

step-son ,step-mother ,step-brother ,sister-in-law ,parent-in-law变为复数
step-son ,step-mother ,step-brother ,sister-in-law ,parent-in-law
变为复数

step-son ,step-mother ,step-brother ,sister-in-law ,parent-in-law变为复数
step-sons
step-mothers
step-brothers
sisters-in-law
parents-in-law