@ Lightning_Boy
This is only correct, if the instructor acts as flight instructor. Two PPLs, which would be the case here, can not log both PIC-time. If the CFI does all the flying, he acts as the PIC and the PPL can not log PIC-time. That is the same for two CFIs flying together for fun and not for instruction. Only the one who is the sole manipulator of the controls can log PIC. The only difference is, that when you, as a rated pilot, fly with a CFI who instructs you, you can log PIC-time. There is a reason to this and you can ask the FAA why they do things diffrent then the CAA which is the one and only real rule making agency in the world.