Ancestral trauma/patterns is real? bullshit?

I've been working with a healer the past year that holds a more ancestral trauma frame being transmitted down the line. To believe such a thing, you kinda have to believe there's either (A) a non-material way of transmitting such trauma across generations or (B) we simply don't have the physical causation yet.

We do have the epigenetics research that shows descendants of people from poverty or famine have an effect even if their own upbringing didn't feature it at all.

On another hand, whatever is true subjectively is well true subjectively. 

Is it simply an interpretation of our inner experience or could there be explanatory power?