This is his sister and that,s his son.怎么改为复数形式

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Thisishissisterandthat,shisson.怎么改为复数形式Thisishissisterandthat,shisson.怎么改为复数形式Thisishissisterandthat

This is his sister and that,s his son.怎么改为复数形式
This is his sister and that,s his son.怎么改为复数形式

This is his sister and that,s his son.怎么改为复数形式
These are his sisters and those are his sons.