Are you planning to keep this car for a few years or more? Because 5 and 10 year olds are only going to get bigger, as are their bikes, cricket bats, sports kits, friends etc. At 12, DS is 5’8”, and DD is 4’10”. I don’t think we’d be very comfy in an Aygo for long. Having said that, a couple of years ago I turned down a Juke because the boot is was tiny.
FWIW, I’ve had a Skoda Fabia estate and a Golf estate in recent years and have liked them a lot. I’m not a petrol head at all, but they’ve absorbed us and our stuff quite easily and have been reliable.