Children often ask, “Where was God before He created the earth? How would you answer that question? Would you posit and try to define some sort of ethereal space for them? If so, you’d confuse them–and, to boot, wrongly teach. God wasn’t in some non-space, space! He created space. Well, where was He? Answer them this way: God wasn’t any where–He created all the “wheres.” There was nothing but God, Father, Son and Spirit.
Older children may ask, could God create a rock heavier than He could lift? Could He create a square circle? Think those two through. I’m not going to give you the answer. There is a good one–but you must figure it out on your own. Best wishes!