Welcome to the forum. Am sorry to hear of the difficulties.
To varying degrees i think it's often part of what goes with things in areas of mental health. So firstly don't think it's unusual or odd, it happens a lot. People often do blame & attack the ones closest to us.
There's a lot written about healthy boundaries, non violent communication, co-dependency & many areas of understanding & dealing with all these things, from a carers & patient perspective.
i had a lot more anger & resentment at one stage & there was a lot of arguing & dysfunctionality within my own family. Things did improve, but there are still ongoing issues.
We all need understanding & support. As hard as it is i've found as far as possible allowing people to be & focusing on letting go of all control, blame, looking after myself & living my own life as best that i can, to have helped. Allow other people their own lives & paths, however painful. What can we really do about the lives & behaviour of others? For me acceptance, gratitude & forgiveness has been key to things.
It's also controversial, but there is a place for tough love in my view - when people are faced more fully with the consequences of their own actions, choices & have to confront their own responsibility, it is often a catalyst for their own growth & healing. Often we do unwittingly enable our loved ones in unhealthy patterns.
i hope that the situation improves for you soon. i also feel it's the right things to be kind & caring, but you also do need to look after your own welfare & have your own life.