Fuggs, owning and loving in a duplex is like the first step towards becoming a self-sufficient landlord. When I was born, my family lived in a duplex - that my father built. You live in one unit and the rent income from the other unit covers the mortgage for you.
A couple years later we moved - to another duplex my father built. Same deal - rent income at the new house paid the mortgage, but now there were three rent streams snowballing instead of the one. I was probably eight or nine before I actually lived in the single-family house I grew up in.