What Is Child Pay for Parent?

If you have two transactions that are the same number of lights, the same size, then the effect ove fee would be the average of those two transactions. But if your first transaction gets purged out of the mem pool, right? If you're in a h sustained so ifyou say you mistaken, you used one sat perit on your trnd, the mem pool surges up and that gets purged and dleated. And specifically, would childs pay for child pays for parent, a which, by the way, i just think i's such funny, they cointer, but because mos usually parents pay for their children.