The trauma experienced by your grandparents can be carried in expression of your genes, creating neurological or behavioral disorders that are an adaptive response to experiences you never had.
To resolve that trauma, you will need new experiences that position you in control. The best way to do that may be thru play acting, such as improvisational theater, with a qualified therapist and a willing cast of supporting actors.
See the full article on epigenetics below.
How play might resolve trauma and rewrite your epigenome