My question is how in the heck did Diversity training take 6 YEARS to complete? I can sum it up in one sentence, Diversity means white people are privileged if you agree with, the ideology, fragile if you don't, and supremest if you if you speak up against it and BIPOC get everything free. Oh yeah and LQBTQIAP.
Your tissues hold your issues. From my experience in natural medicine people with arthritis generally are stressed out, worriers that are trying to control a life that that feels out of control. Most of the pain comes from inflammation and lack of oxygen. Your dad is going to do what your dad wants to do. My suggestion is you let go of trying to fix him so you don't end up being just like him.