my family has five people,my father(dad),my monther(mom),my sister and i.
用第一种说法就可以了
第二种翻译的有问题，TWO SISTER是说你有两个姐妹与句意不符。
这两种说法都没错都可以的
There are five people in my family.My father,my mother,two of my sisters and I.
后者较好，因为用me较显谦虚
in
my
family
there's
my
father,
my
mother,
my
sister
and
i.
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