I have a 2008 Trafic van, the 9 seat version with Windows all round.
I feel the brakes in mine are a bit spongy and that there is a fair amount of pedal travel too. My mate drove it and also thought the same.
I’ve had the rear calipers off, changed pads and bled the system but it still feels the same.
Could it be that your dad’s van has a different abs unit or Master cylinder etc and that the brakes just have better feel?
Mine stops fine when you stamp the pedal, the pedal just doesn’t feel that great.