Bruce Jenner -- Kids Deliver Shocking News ... Don't Do Reality TV!

In a truly weird turn, Bruce Jenner's sons, along with Kim Kardashian, are warning him to slow down on revealing too much of his journey on reality TV.

Sources connected with Bruce's brood tell us, Kim and the boys think Bruce was spectacular on the Diane Sawyer special and won over millions of people in the process.

They say they're worried Bruce's upcoming docuseries might "de-class" what he's accomplished. We're told they also urged Bruce not to do other interviews and finish the process in private.

We're told some of the kids have gone to their dad to express their concern, but the ship has sailed. Bruce believes the docuseries will educate people and create empathy, so he's committed.

We're also told Bruce's kids won't appear on his show.