There are quite a few options when it comes to cars that can comfortably take three child seats. We'd always strongly recommend Isofix for all child seats as it's far safer than purely a seatbelt mount. If your son is looking for an SUV, depending on budget we would recommend the current Audi Q7 or for something cheaper, the Peugeot 5008 which both have three Isofix mountings in the middle row.

He could do down the less fashionable MPV route, but these do have lots of space. We'd recommend the Ford S-MAX but there's also the Ford Galaxy, SEAT Alhambra, Volkswagen Touran and the Citroen Grand C4 Picasso (later nenamed the Grand C4 Spacetourer) that are worth checking out.

As these are all seven seaters, depending on how old your granddaughter is (and what car seat she has), she can either sit in the middle or alternatively the back row. The only difficulty is that with a Group 0+ child seat on both outer seats, access to the rear seats is pretty much impossible.

If you're on more of a budget, the Vauxhall Insignia Sport can take three child seats on the back row although it's not as roomy as an SUV. If you want practicality, there are options like the Citroen Berlingo from 2018 onwards. The second row has three individual seats, each of which has Isofix, and there's also the option of the Berlingo XL which has seven seats.