I have one older brother and he study on Ukraine. And you?

 büyük bir kardeşim var ve Ukranya da calışıyor sen de?

my try

Is this correct?

correct

thx

I am sorry deli but it was not totally correct.

Bir ağabeyim(erkek kardeşim) var ve Ukrayna´da okuyor. Ya senin?

ağabey - older brother

If the person is asking about his/her siblings too, the question is "Ya senin?" If something else it is probably "Ya sen?"