Thanks for the ADD hint. we have discussed that as well. I checked out a self-diagnosis check list, which indicates at what point one should react. there are some obvious symptoms as you said, but some are just clearly against it (he can be sooooooo organized at work). but the whole calendar thing is true - time is very abstract for him. but maybe this really needs to be taken a closer look at. but isn't it also a "fashion" to diagnose ADD?? i might be mistaken, but at school all of a sudden so many kids are ADD. but you might know more about it (but that is not the topic here).
AND YES, you say it: I have THREE kids. well,to be honest we have a new au pair (who is so helpful), but who needs integration, so I am actually responsible for FOUR (in some way). :-)