Yeah, it's yet another person looking for the title of a story. I've been trying to figure this out for about 5 years now, and I'm pretty sure it's Bradbury. The best I can remember, it's about a boy whose father trained him to always follow orders, so he stands by and watches the father drowned because he had been ordered to stand at attention.

Any help is greatly appreciated.

It's called "By the Numbers," and can be found in The Toynbee Convector.