My dad out and out refuses to get in my cossie. In the three and a halfr years I've had him my dad has covered about 8 miles in the passenger seat and that is MORE than enough for both of us.
My mum however is a different matter. You can be quite happily cruising along at seventy on the motorway when a scoob/BM/bus goes past and I get 'Do him Cola, do him'.
Bless her.