Yellowstone's Edge is a great RV Park. But it is a 45 minute drive to Yellowstone Park's North Entrance. That adds an hour and a half to your already long day. There are parks within blocks of the North Entrance, perhaps you should get reservations there instead. What type of vehicle are you going to be driving with 7 people? Normally, I would suggest you book some bus tours, but they aren't running this year due to virus concerns. I sure hope your children are really into the outdoors. Because if they are not, Yellowstone and the surrounding amenities don't offer a great deal of other activities. There aren't amusement parks, water parks, go cart tracks or other diversions for the kids. Good luck.