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I can hear how much frustration you have for the fact that you have done a lot of healing work, have carried your parent's pain and unconscious patterns, and now just want them to get to the basic realisations that could help turn their lives around. It can make relating in the old ways with them very uncomfortable because you have changed, but they haven't been able to. For them to change might be very scary, because their whole life, their history would need to be examined. It can be too much for some people, if they are carrying unspoken traumas, or were not equipped with the skills to be able to examine their baggage.
Sometimes, I think part of loving ourselves through trauma/disfunction, is grieving our histories and forgiving them, forgiving what was passed down to us. Even or especially when we can't fix them in the ways we might hope. I can hear the compassion you have for your parents and siblings, for what was done.
A good friend of mine once gave me some advice, and it's taken me a few years to really understand (I'm probably still learning to understand it). She said 'healing isn't linear, it's not something we can give or ask of others. It's only something we give ourselves, and then that radiates outwards and changes things somehow'. It's helped me wrestle with the compassion, guilt and anger that trauma can bring.
Would your dad ever be open to talking/counselling with you?