Reader and lurker for many years and finally created an account.
For quite some time we had three car seats (two front facing, one rear-facing base / carrier for the baby) installed in the back of a 1995 BMW 5-series. It was always fun to watch other peoples' expressions as we parked and began to extract the family. When we bought the older kids' seats, we parked in the store's fire lane and carried out nearly every model to test for fit.
The black leather upholstery was super easy to keep clean, the enormous trunk held plenty of camping gear, and with a light touch on the pedals we averaged close to 30 mpg. Sadly, the arrival of kid #4 and maintenance on a twelve year old european car - even when using the local independent guy - proved too expensive. We donated it to the kidney people and took a nice deduction.
BTW we were the car's second owner, paying cash for 120k freeway miles and a folder of meticulous maintenance records. When the kidney people took it away, she'd just rolled over 210k.