Hi saeb,
I haven't come across this form in particular (although, if you wrote it, I'm sure it's correct).
Could you explain the difference between this sentence and
أين أبوك؟
(In the meaning of "Where's your father?", of course, not in other meanings).
not much to explain, أباك is wrong xD (since it's a مبتدأ مؤخر here)
Well, I didn't want to categorically say it was wrong, lest there was a certain form in Arabic that I wasn't familiar with.
Thanks :)