I don't completely understand situations in which authorities can remove children, but I would guess you may be at risk for that.

Tillie's comments about no clutter zones may be especially important for you.

Telling your mother she has to move back to her room from the living room and that you will be keeping the common areas, Living Room, Kitchen, Eating Area and Bathroom clean. Period!

If you are unable to accomplish that, the safest action for you and your children is likely to be that you move out.

Those other threads will give you ideas about the views of other posters on the site about your situation.

Hi, welcome. Most of us post on the "the daily chat" section. You might want to go there and post so more people will see your post and offer support. the chat on Sunday evening is really helpful.
Have you read books on the subject? Buried in Treasures, Digging out, are two books that come to mind.
Hoarders will not change until they want to change. Pictures are powerful reality checks, could you take pictures of the areas, and show her the pictures and ask if she would like help organizing any particular area. The books have lots of ways to understand hoarding and what is not helpful. Being critical usually does nothing but push hoarder away. She is meeting a need to fill the void created by the loss of her husband. Loving understanding is so important. I wish you well.

My children and I moved in with my parents after my father suffered a debilitating stroke. Well, after my father's death, my mother became a hoarder. She has 3 closets full of clothes, cupboards full of food, and an entire room that is so filled with junk that she has moved to the living room, which used to a room that I could keep tidy! She gets emotionally unhinged when I clean up her "stuff", an assortment of magazine ads, coupons, trash, old newspaper clippings, and envelopes she jotted notes on two years ago.
How can I best help her clean up and deal with all her stuff?