Okay, I thought I remembered that duckling from another thread: It is a domestic duck not a wild one. Domestic ducks are not supposed to be "released to the wild", irregardless if this is where you found its egg or not. I will all but guarantee that if you take that little baby to the pond and release it, something will have made it into a midnight snack by the next day. It has no survival skills.
Also, until it is feathered, it needs a mother to keep it warm. Lacking that, requires a heat light.
So, why are your parents having the sudden change of heart? I mean they were on board when you built an incubator and hatched it, and have been raising it for several days? Now it suddenly must be let go?
I am not on your case. Your parents sound like they are trying to do the right thing. However, since this is not a wild species, but a domestic one, it would be irresponsible and possibly illegal to release it to the wild.
Put this little guy on the Jackson, MS Craigslist and on here under the for sale section: It is the fourth catagory: Other Poultry - Birds and Hatching Eggs. That is the more responsible thing to do.