Just got back from supermarket, where a delightful woman in her 40s took the (then) last parent and child space. Her only passenger was an old woman.
DH rolled down the window and thanked her taking the last space (sarcastically of course) to which she responded that the old woman (who wasn't even leaving the car!) was disabled. He pointed out there was a free disabled space next to the parent ones and drove on.
Found a space (hoorah!)which was fun being as i'm 9mths pregnant and we have 16mth old, then DH was congragulated by another mum in her car for telling her off.
Cue smug hero Dad
He still looks pleased with himself! Bless him.