one big younger sister and two small younger brothers
200
那是谁？
那是我大弟弟。（T）
Who is that?
It's my big younger brother.
300
你有兄弟姐妹吗？
我没有／有（兄弟姐妹）。
300
Who is she?
She is my good friend.（T）
她是谁？
她是我好朋友。
400
How many siblings do you have?
I have one elder brother, two younger brothers, two elder sisters. I have no younger sisters.
你有几个兄弟姐妹？
我有一个哥哥，两个弟弟，两个姐姐。我没有妹妹。
400
Who are they?
They are my big younger sister and small younger brother. （T）
他们是谁？
他们是我的大妹妹和小弟弟。
500
This is Li'an' family. There are 6 people in his family. They are his Mum, Dad, one elder brother, two younger sister and him. They are all British and they live in Hong Kong.