姐妹用英语怎么说?她是我姐姐她是我妹妹这两句英语怎么说?

姐妹用英语怎么说?
她是我姐姐
她是我妹妹
这两句英语怎么说?

She is my elder sister.
She is my younger sister.

She is my older syster. She is my younger syster.

she is my older/younger sister