uh... that doesn't help my goldies, or me. I care a lot more about my goldfish that my parent's ignorant "wishes". They don't know anything about ponds, they're just assuming it'll be difficult to take care of. The goldfish HAVE to go in a pond, so its not like because they don't want a pond that I can just leave them in a tank. So no, I'm not going to respect their "wishes". And when I move out, I wouldn't leave my goldfish behind. If they wanted they could fill the pond in then.
Goldfish are sub tropical, not coldwater. Like I said, with the pond in the shade and it being 5 ft deep, surely it shouldn't get too hot.