✔ 最佳答案
1.how many siblings do u have?
or
how many siblings are there in your family?
or
how many brothers or sisters do u have (in your family)?
2.where are you come from?
or
which country are you (come) from?
你在那裏來的? <----------- you didn't write it very clear!
if you are asking ur friend that 你在那裏來的?=你剛剛去了那ar?
you can say like: where have you been?
where did u go (before)?
etc......!!!~