As a nanny I have driven many cars over the years and the volvo XC90 was one of my favourites, very comfortable and easy to drive and never had problems parking it. I currently drive a VW Passat estate and I would argue it is just as long and wide as the volvo xc90 just not quite as high so I do think it depends on the 4x4 you are referring to. I have also had a mercedes c220 which has 6 gears, not that i even saw 4th or 5th on the school run around London
that could guzzle diesel like no ones business.
The argument of, if you have 3 children you need one is utterly ridiculous, one of my employers actually sold her BMW X5 because she couldn't get 3 car seats across the back of hers and the same with a Range Rover, they reluctantly gave in and bought a people carrier.
I own a Honda civic and depending on the type of car seats I can get 3 children across the back. I have had 2 boosters and britax in the middle, or two britax's and an older child in the middle.
Range rover sports and ones alike do seem completely pointless they aren't spacious inside and can actually move quite fast (unlike volvos) and contrary to the first poster I find these are mainly driven by men and are extension of their ego erhem