The first batch is hardly 20 days old! my grandfather wants to keep the eggs><we only have 3 tanks one full of fry ,one full of eggs and one with the adult fish...i don't know what to do><

i have 5 goldfish.i dunno which one are female and male.today they spawned again, i have another BATCH OF FRY in another tank.Is it possible for the same fish to spawn within 2 week?

yes.