My 17 yr old son was asked on several occasions to be ready to leave the house at 7.50 to catch a train to military college. He decided that we only needed 15 mins and therefore this morning refused to be ready til 8.00. As it happens, there was no traffic delay so we had enough time but as it is my car, my petrol, and my time I feel it's disrespectful to ignore my request. As he intends to join the army I am tempted to text him to walk the 3 miles back when he returns this evening by way of showing that he cannot dictate all the terms when he is contributing nothing to the household. Is this too extreme? What would other Mothers suggest?