MadCityCyclist

If you're going to go on family rides you might want to look into getting bags, a front basket and/or the rear rack option. That way you can easily carry water, sunblock, and other stuff for the family.

One option I really enjoy is the EZ Wheels. I fold up the bike excluding the handlebars and use it as a cart when grocery shopping, Brompton calls it "shopping cart mode." It is guaranteed to get lots of looks and tons of questions, especially if you live in a bike-friendly town like I do. It's also great because I never have to lock up the bike outside where it would inevitably be scratched, I take the bike inside and go shopping with it. Other Brompton owners who don't want to use their bike AS a shopping cart, still fold it up and put it IN their shopping cart so they don't have to worry about locking it up.