I'm sending you a lot of love right now. I was in a very similar situation just a few months ago. My mom pushed me out of her house with her comments. I am now, on my own, finally healing and forgiving her properly; whereas, in her home, it would have been impossible (like the old saying, "too close to home").
I believe that if both family members are not receptive to healing on the same level, it can be fruitless (and possibly, as in my case, harmful) to try, unfortunately.
Because someone can't change (or influence) another if they're not ready, I personally think the best way for someone to heal from old wounds is on their own or with the help of others who are on the same path and/or a professional (e.g. therapist, counselor).
The good news is, once the person heals, they can inspire and help the other person to heal as well (if and only if they are ready, of course). Otherwise, no healing occurs for either person.
So I honestly believe it would be best if you were to venture on your own (if possible) and do your own healing in a safer environment that is not so triggering.
I wish you the utmost best in your quest and please know that it is possible