Wiflib.
This site, the Leeds Teaching Hospital, is aimed at children and young adults so may be useful in explaining carb counting in a simple way. Lots of useful information:
http://www.leedsth.nhs.uk/sites/diabete ... ingRef.php
From the same site, again aimed at teenagers is this explanation of the Pancreas and how it functions:
http://www.leedsth.nhs.uk/sites/diabete ... ncreas.php
One book that I have found useful for simple explanations to older people and young adults alike is,
'Diabetes for Dummies' (3rd Edition) by Alan Rubin.MD. I have the American Version which is more up to date than the present UK issue. It costs around £15 and is usually available from all good bookshops and places like Amazon online. It treats most things simply and is an invaluable resource.
Then of course there is the excellent Newbies Guide to Low Carbing by Fergus from this site. Here is the link:
viewtopic.php?f=18&t=7215
One thing that I simply don't understand is your reluctance to tell anybody, especially your father, about your Diabetes ? Just a thought, but if your father knew that you were controlling your own Diabetes with a low carb method, maybe he would be more prepared to listen to you as you are speaking from experience....? Something I think he would understand even if he is 86 yrs old.
He really needs to be able to test regularly as there is the danger of going hypoglycaemic if he gets it all wrong. As a T2 that shouldn't be catastrophic but may not be very pleasant, he should 'liver dump' and get back to a more normal level. So long as he understands that he should be fine. He needs to know the treatment of a hypo, fast acting carbs, such as Lucozade, Gluco Tabs etc then a small 'carby' snack to stabilise the levels. Make sure he understands that clearly....no Mars Bar's until after the 'quick fix !'
I wish you luck with your task, not an easy one by any means ! I hope that the links I have posted will be of some use to you.