If you have two kids and the grandparents live with you (our situation), unfortunately SUVs are more or less the only option. Otherwise you take two cars everywhere, and two sedans are worse for the environment than one SUV.
https://css.umich.edu/factsheets/personal-transportation-fac...
In my case, I have a pickup truck I need for work, but I don't drive enough outside of work to justify the cost of keeping my smaller car on the road also.
I would load my 3 kids up, take them to day care, got to work. My wife would pick them up from day care and I would drive home without kids.
The SUV was the smallest vehicle I could get to transport 3 kids in car seats. And I needed to drive my kids to day care.