As a survivor married to a survivor...yes. Just yes.
My family denied like your father has, and I'm now no-contact with them because their denial kept re-victimizing me emotionally, along with other actions they've taken that directly placed my well-being and my family in poor situations. I needed (and still need) the distance from them until both my husband and I are healed more.
My husband's family avoids and talks in generalizations. They talk 'around' topics. I don't blame him for not disclosing; he's blamed by their subject-changing, etc.
It could be their shame, or guilt, sure. All I can say (from the f experience in healing and from supporting my husband is: work on you. That's all you can do.