US Immigration from Pakistan

Eventhough letter only address myself for N-400 appt. does it also include my son? Should I take him for the interview appt?

Does any one know how long it take if you put in AP? My dad had his interview on Jan 24, the interview officer told him that every thing was good but he had to answer some questions which they asked him through email. So my dad replied to their email and answer everything on the next day. the visa officer kept his passport too. Its been 2 months now and we are still waiting for his visa. He is in AP process. I dont know how long it will take more to issue his visa? Can any one please tell me? His category is IR 5 immigrant visa.

Thanks.

I have got IR1 visa through my wife. We are living together in Pakistan with our two child who also have IR 2 visa. Can I move to USA without wife and child for living arrangements as we have no arrangement in USA to live there.

If one has submitted IRS transcripts to NVC, is it pertinent to also submit W-2/1099? In other words, will NVC send an RFE if only IRS transcripts have been submitted and not W-2/1099?

Could someone share with me the list of documents required at USCIS & NVC stage when sponsoring mother to US from Pakistan specifically?