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It, in fact, still is, but is incorrectly punctuated.  

If you write a book and have a title Where is Daddy?

It's still a question, mark or not.  "Who ate my socks?" classic book, starts with a question.  Who plays on who (afterthought m) is a question.  Which is answered straight after it is asked.   Who can be used as a non interrogative word as in "John, who didn't know Alex was behind him with a screw driver"  But if we omit John, it becomes "who didn't know Alex was behind him with a screw driver."  Now it is a question, the answer to which, is "John"