I find that the best conversations are around the dinner table. Dinner time is family time in our home. We try to always eat togther no matter what are schedules are. After we figure out whos turn it is to say grace, we start with asking each child what they did at school, favorite part of the day, etc. Then,the kids take turns asking us about our day. For those conversation that need a little more privacy, my kids will tell me that they need to talk and I will get the others occupied with a video or craft. Then, we have the privacy to talk about anything and everything.
I would have to say, "car talk" is only good when there is one kid in the car. In my case, where there are six kids crammed into one minivan, there's not much privacy--and LOT of noise.