TrackyBottoms
re your comment:-
"It's not intentional to upset me/DC (teens) but it definitely lacks control. When he's happy, it's great (he projects that mood too) but if he's POd then he's like a dementor sucking the mood from the room. The 'leave him' advice isn't really what I'm after - what do you actually do to make/help someone get a grip of themselves? "
Oh but it is intentional, do not kid yourself it is not. You do not behave like this around the DC and I daresay your H does not behave like that around his work colleagues or to anyone else in the outside world.
You may not want the "leave him" advice but its something you're going to have to seriously consider here if you do want a life of your own without this crap in it. You've already spent 30 years together, do you want to spend the next two decades plus living like this too?. Changing one aspect of your own behaviour is hard enough, expecting and or asking someone else to change theirs is an impossible task. Your H does this because he can, he feels entitled to do so and it works for him. Something he also learnt from your FIL who I see without surprise is the same. After all we learn about relationships first and foremost from our parents, look what his taught him.
Also writing such about not necessarily wanting leave him advice makes you look defensive of him. You have a choice re this man and your children do not. Examine your own reasons far more carefully as to why you do not (currently) want to leave him; is it really because of fear of him, fear of the unknown, fear of being alone, the kids (who BTW will not say "thanks mum" to you for remaining with him), a lifestyle you wish to maintain?. All of this and more besides can play into such thinking but no obstacle is insurmountable.
Women in poor relationships often write the good dad comment when they can think of nothing else positive to write about their man.
What do you want to teach your kids about relationships and what are they learning here?. Chances are they could well go onto choose mood hoovers or dominators themselves as partners; its really no legacy to leave them. Remember too that the only acceptable level of abuse in a relationship is NONE.
You have a choice re this man and your children do not. Make some choices with you and your kids in mind; put yourselves first rather than your H.
I would also suggest you read "Living with the Dominator" by Pat Craven. It likely describes your family home life to a tee.