can one log PIC if another person is flying

And to add to =that=, if the safety pilot is not acting as PIC, he can log SiC
time.

Jose

I've never quite understood what qualified for SiC time... if I go up
with a friend, and both of us have the ratings and such applicable to
the aircraft, does one person go PIC and the other SIC? Or can I only
do that if the aircraft is required to have 2 pilots?

Also, I've been logging the time I fly with my dad, even though I'm
not technically able to be PIC (no tailwheel signoff). I made up a
category I called "second pilot", since I figured that I was gaining
experience and all but I couldn't put it down as SIC. Could I have?