In the physical sense, human beings do share quite a lot together; information and food are two examples that immediately spring to mind. But this only relates to the illusion that is life on this dreamland stage we call the earth. In truth, we are all just passing clouds regardless of our relationships with each other. Whether friends, siblings, parents, offspring, work colleagues, or even so-called enemies, we are all nothing more than ships that pass in the night. The only thing truly shared between humans is the experience of being.
Our true nature is that of infinite consciousness, which is all there is. The experience of “being” is the experience of our true nature; all else is an illusion.