My husband was one of 3 kids and he constantly reminds me that back then, his entire family had no problem fitting into a small car. OK, I agree that it's tough to get the little ones in & out of a two-door sedan, plus there's the issue of car seats, but you really don't need a gigantic mini-van or SUV. The Mini Countryman will do just fine.
...Reminds me of watching "House Hunters" and seeing people who MUST have a 4,000 square foot, 5-bedroom house for themselves and their two kids. Don't children share bedrooms anymore? Bunk beds? Do you REALLY need a separate room for the toys, or a three-car garage? Why do master bedrooms need to be huge palaces the size of my living room? No wonder people get into so much debt!