Sadly my dad is nearing 80 and refuses to believe that his whole side of the family was rotten with us ADHDers. My mother can see it clearly (she's a good woman who merely raises her eyes to the sky when dad does his little things). Both have accepted that I have ADHD and that it removes the burden they had of thinking they did something wrong with me. But Dad - he's not going to buy it - and he's done fine in his eyes (and mostly fine in mine) so I'm not rocking the boat.
Glad peita you made some leeway there. It's nice to be believed (but not essential really).
Look at it from my perspective and it sounds even better.I don't know if you guys remember me talking about my mum being skeptical about the whole ADHD thing or not but she has been reading some info I printed out for her.
Last night when I was over there I was in talking to my Dad (who is very much like me) when my mum came in. Dad was talking about something and then without warning changed the converstion completely. I hadn't even noticed and picked up the new topic when my mum says almost to herself
"Well that was an ADD moment!!"
I was in fits, one because my mum actually picked up on it and two because Dad didn't see what he had done that was considered an ADD trait 
Peita,
I think it's time now to give your Dad the information to read!
.....I'm so happy for you that your mom actually read it and appears to be retaining some of the info....Good for you!!