the responses will be along the lines of "how dare you. you don't know anything about our family".
except i probably do. if you are a 4-person two car family in suburban saanich and one is your suburban and one is your jeep i bet you also take lots of vacations by jet and have a house that uses much more energy than another 4-person family that has no car and lives in fernwood.
it's easy to see who uses more carbon. extremely easy in most cases.