My mother is the best cook I know, and I learned much from her. Of course it doesn't make me the best cook I know. My wife cooks much better than I do.
I learned from my older sisters who learned from my mom. Both parents worked a lot when I was younger so they basically raised me. Came in handy when I was living alone before getting married. (Actually comes in more handy now!)
I'm self taught, but my culinary expertise is limited to breakfast and grilling. Occasionally I'll help my wife make a stew or chili, but that is a joint effort and it's usually her recipe.