1. Again, questions 12 and 13 are not applicable to DV based AOS applications, there’s no underlying petition associated with a DV based application. Your family member cannot “petition you” for DV. Your family member can petition you for a family based AOS, your employer can petition you for an employment based AOS. DV has no underlying petition associated with it.
2. No, that is not what the question is asking. It is asking if you, as the principal applicant, have an underlying petition filed by your family member or employer which your AOS application is based on.
3. Maybe we’re looking at different versions of the I485? Question 11 on the form I’m looking at has nothing to do with the USCIS account number, so I don’t know what your question is about. In general, if a question is not applicable to you, simple answer N/A or NONE in response.