1-Three families with two cars lived in the building at end of the street.
2-Three families who had two cars lived in the building at end of the street.
In which case
a-Each of the families has two cars (six cars in all)
and in which
b-The three families share two cars (two cars in all)
Three families who each owned two cars lived...
Three families who shared two cars among them lived ...
The idea of three families sharing cars seems quite odd.
Last edited by emsr2d2; 03-Aug-2013 at 17:24. Reason: Typo correction
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
Three two-car families lived in the building at the end of the street.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.