I understand why people would think that he had a child or something, especially the thing he says in Unborn child;
"All i wanted was for you to have a better life than i had, so i was out here on a 24 hour, 365 grind, when you get to be my age, your'll understand".
To me, that sounds like Pac explaining why he worked that hard, to make a way for his kids, incase he'd pass away.