Oh, that's so right... Brad will surprise yet again and again - I like to believe. He didn't forget Lyn all these years. If there had been nothing there, he would've done that by now. Lyn made a promise he couldn't keep, and that's another part of life I wanted to portray here. Despite our best intentions, there's only this much control we can exert over our actions and even our thoughts. Brad is, to a degree, 'entitled' to see himself abandoned. Lyn, for all the good he tries to do, is cruel in his own way. Also, there's a codependency here; I won't call it unhealthy, it's not my place, and when people insist too much on this by naming it that, I think they don't understand what loneliness can do to a person.
I expected you guys to analyze Brad from a medical standpoint, as is natural. I can see why your interpretations apply. There is something going on; but, as usual, I will let the characters say them out loud.
I was quite surprised later in life when I learned about dyslexia being more than just 'inability to read some words'. My heart goes to you and your daughter. I'm sure she's happy she has such a good dad, as I feel that you are.