We don't have a car and we take the train to visit family a lot and usually get picked up on the other end. Our stroller's been great because we just pop the infant seat on the chassis so we've got it when we get to our destination and jump in the car. Now DS is 9 months and I know we've only got a few months left out of the infant seat.

So, if you don't have a car, did you have a carseat for your DC? What did you do when he/she outgrew the infant seat? Did you buy a next stage car seat and lug it around with you or did grandparents get their own for their cars?