What should i pack for camping?

im going camping next week and this is my family's first time. its summer so im pretty sure it will be nice out but i don't know with this weather. we are going to be sleeping in a camper so we don't need to worry about the tents. i think we would only stay for 1 or 2 days im not sure. but what should i pack? and if it rains what im pretty sure it will what should i bring? thanks!