Makescakes . I had the same mother/father combo as your DH. I believe in childhood there was a tendency to "side" with my dad because he seemed like the "sane" one. But I never idolised him. I'm one of 4 and the eldest sibling (and golden child) did idolise him and does to this day in her own weird way. It's not uncommon for childhood abuse victims to latch on to the one sane parent. I think it's quite a breakthrough (was for me, anyway) to realise that they also played a part in the abuse (were even active abusers themselves) by letting it happen - they after all were the adult in the scenario with power to do something and change things. Whenever I asked my father to do something about my mother, all he did was offer (threaten) to leave himself, leaving us terrified we would be left without a sane parent, and grateful to him that he did stick around. It's only now I realise how sick that was. He turned himself into the principal victim and made us feel like we were victimising him, the adult, for asking him to help us, the children.
It's not thread hijacking, your concerns about your DH are very relevant to this discussion, because our partners and children tend to be the ones that bear the brunt of our childhood abuse if it isn't tackled. Again, I think I am like your DH, and you sound like my DH, from a very loving and grounded childhood and struggling to get your head round your partner. I'm also a high achiever who feels stupid and worthless because of my conditioning, and this feeling often bleeds into my parenting. One thing you'll may need to deal with with your DH, which I think plagues me, is the quest for perfection which just simply can't be achieved with unpredictable babies. Trying not to be your own parent can make you into someone who tries to be a perfect parent. But there is no such thing, and he/I will never be that mythical creature. It is accepting that you can't be a perfect parent, but it is enough to be a good enough parent. Accepting that your children do have faults, that they can be annoying, that sometimes you can really hate them, is important and that it's ok to feel like that sometimes, that this doesn't make you your parents, just human; and to realise that feeling is not about them, it is about you, and as long as you don't act out that feeling through abuse, violence, trying to turn them into something they are not, etc, you'll be ok......so much more, we are all still learning.
Has your DH done any reading/counselling? Parenthood can be the catalyst for all the childhood hurt to come out, you should be prepared for this. After years of this tearing my marriage apart, my DH is now reading about it for himself so that he can understand me. These websites: Pete Walker, Out of the Fog, Daughters of Narcissistic Mothers are a good place to start.
Congratulations on the pregnancy!