Bec - it can be very child dependant but your plans sound fine - we do 13 + hour road trips (that is 1200km+) relatively regularly without a DVD player and don't have too much trouble. We find leaving early the key, if they stay awake on departure they get a drink/food and then they tend to go back to sleep for a fair bit until we stop for breakfast around 7am we then tend to get 2 to 3 hours out of them before they need to stop again with food, sleep and toys - I love to be about 1/2 way there before they are really ready to get going for the day. We never stop if one is sleeping if we can at all help it (toilet training can throw a spanner in that). We try and make sure toilets feeds and petrol are tied in together as this minimises our stops (DH hates stopping). We like the early departures because we always find the post lunchtime bit the hardest and grumpiest. I take a bag of toys (we don't have a DVD) and I pull out one at a time for each child and they play and then swap. I usually have a few new toys in the bag so that that holds the enthusiasm longer and plenty of snacks on hand (not necessarily 100% healthy depending on likes) but things that take a while to eat. Good luck with the trip and hope the week with family is enjoyable