Relationship with siblings and mother

I'm a single mother and I live with my mother and siblings in a house. Every since I had my daughter my family has helped me out when I needed help. For example when I go to work they babysit which I am grateful for. But my mother does not respect my authority as my daughter's mother. I tell her don't give my daughter certain foods and she still does it. Tonight my daughter threw a fit and I did not give him. She started crying and my mother sent my brother to take my daughter to her. I told my brother no she's going to stay where im at and learn she cannot throw fits for everything. He took her by force and snatched her from my arms. So there we were tugging my daughter. It turned into a big argument. And I told them they need to respect my authority as a mother when I say no it is NO! She said she doesn't give a damn, if her granddaughter is crying she's going to get in everytime. Then she threw in my face how she babysits her when I go to work. This is one of the many incidents where they don't respect me as her mother.

ANY ADVICE...