Topic: CSPA Interview

hello amazon my F4 category priority date is 01/31/2002 and its approval date is 12/30/2009 ok. so i applied for the CSPA and after CSPA my age goes under 21 so i wanted to know that my interview for U.S visa will takes with my parents or it will be done saperately some other day ?pls answer this ,thanks. [confused]