Unfortunately it's always me that ends up running - they stand there chatting about 'kids always come back when they realise they've gone too far', 'he won't go out of sight...' by which time I am sprinting across beach/playground/shopping centre. This has been going on years, he is 8 now, and finally, finally the other day FIL says 'he won't stop will he!' followed by 'he has no fear does he!' It was a real breakthrough moment and I can only hope he passes his new-found knowledge around the rest of the family!