Hello Milablanche: Thank you for bringing your concern here to PC. I see this is your first post. So... welcome to Psych Central. One additional forum, here on PC, that may be of interest to you would be the relationships forum. Here's a link:

https://psychcentralforums.com/relat...communication/

I'm sorry you are caught in the middle of such a difficult situation. Honestly I don't think there would be any suggestions I could offer that would be of help. (Perhaps there will be other PC members who will have some insights & suggestions they can share.) My personal opinion would be the circumstances you describe are sufficiently complicated that the best alternative may be for you to seek the services of a counselor or mental health therapist if that is something you could do. A mental health professional is going to be in a position to help you figure out the dynamics of this situation as well as to develop strategies for coping with it.

Here are links to 7 articles, from Psych Central's archives. The first 2, on the subject of depression, provide links to additional articles on the subject. The next 3 links are to articles that deal with the subject of toxic parents. The second to the last link is to an article that offers suggestions for dealing with difficult family members. And the final link is to a blog titled "The Knotted Mother-Daughter Relationship". (You didn't mention your gender in your post. However I'm assuming you are female.) Not all of the articles in this blog are going to be relevant to your circumstances. But I think there are enough that will be to make the blog worth taking a look at:

Depression: Symptoms, Types & Treatments | Psych Central

Living with Depression: A Guide for Coping with Depressive Feelings | Psych Central

Are Your Parents Toxic?

15 Signs You Have Toxic Parents | Happily Imperfect

https://blogs.psychcentral.com/imper...dium=popular17

https://psychcentral.com/blog/how-to...amily-members/

https://blogs.psychcentral.com/knotted/

I hope you find PC to be of benefit.