Quick question guys,

I want to apply for AP to visit my father that I haven't seen in almost 20 years, and just learned that he has liver problems may not last long. So my questions is in order to apply do I have to be married to a US citizen? or waiting for my green card or something like that? I am not married, or have any application pending with USCIS. I am approved for DACA already, I am a bit confused. Any info I really appreciated.