Mei,
Ur accident sounds bad. Thankfully, everyone is alright. Hope ur kids didn't get a shock.
My car was also hit by a van 3 weeks ago. Me quite su ku, took me a while to figure out that the sound was from my own car.
Kam,
Can squeeze booster seat, car seat and 1 passenger behind. Me lor. Quite squeezy if u have the nomal salon car like Vios, Sunny etc. Bigger car, definitely no problem. Other days, elder boy take front passenger seat. Maid, #2 nd I squeeze behind. No money for bigger car (I mean myself), must opt for such arrangement.