Ford Galaxy (basically the same as VW Sharan and SEAT Alhambra).
Mine is a few generations old (2003). Available in petrol or diesel.
Three rows of seats - two up front, three individual seats in the middle row and two individual seats in the back so spacious and comfortable for 7 adults. Capacity like a bus but drives like a car.
In my older model each seat can be taken out separately (but they are very heavy), in the newer ones the back row are a bit different and fold flat to the floor.
When the back 2 seats are out, the boot is like a cavern, great for prams, huge amounts of luggage, trips to the dump (fridges, washing machines no problem).
Finally, each seat can be bought with a child seat/booster built in. And there are enough around second-hand to be able to swap an existing ordinary seat for a child seat very cheaply.