One of the things I've heard about baby boomers is they were one of the first generations of fatherless fathers, because so many of their fathers were in WW2 and either died or came back scarred, unable to cope properly.
I found that opening up to my dad was part of what healed our relationship. Problem is that you assume a lot of risk emotionally when you do that. I've had the support of my wife so I felt able to take that risk, even though it could have easily backfired.
I understand that. I've been able to open up about what I go through with CPTSD because or a narcissist, but I've not been able to reach out to him about his PTSD and what he's seen and lived. Perhaps some day I will get there.