But I don't want to be treated like family. In particular, I am not ready to have the same level of obligations towards my employers, even if these were reciprocated faithfully. I have my own family to which I'm always going to have a stronger loyalty than to any employer.

A company as a group of close friends? Be my guest. A company that pretends that we have bonds of blood, or are married? Not for me (unless we're actually family, as in family business).