Just curious, if you and DP/DH are both in the car at the same time, who drives?
For us it's DH 99% of the time as he 'can't relax' when I'm driving, and to the honest, it's just easier for me to leave him to it and then I get a chance to relax/day dream/look at phone myself. When I do drive he is constantly on edge and comments, grrrr! He clearly thinks he is a much better driver.
With my parents, it's the same. Dad always drives. Even if they are in Mum's car.