Hi Grea, what we really could do with is for the moderators to move your post into a thread of your own. But in the meantime, I think you should stop googling - ductal prostate cancer is very rare but most of the info on the internet is not relevant to your case. I doubt the GP is minimising the results but he may not know very much about prostate cancer.
You really need to wait until you see the specialist - with only one core showing ductal, there is a really good chance that your OH has been diagnosed early enough for curative treatment .... the specialist may recommend that surgery is the best option in your case though as ductal PCa does not always respond to hormone treatments well.
I don't think you should tell the children anything just yet - perhaps best to wait for the proper results first.