I need a house or I, my daughter and my grandmother will live on the street

hello, my name is Rita, I am 37 years old and I am a single mother, I have a 15 year old daughter, my daughter's father left me when she was 3 and does not help with any expenses I also have my 86 year old grandmother in my charge, we live in a rented apartment that I pay with more than half of my salary, which is only 600 euros.

the owner of the house where I live wants to sell the house and wants me to leave with my daughter and grandmother.

because of my low salary (only 600 €) I cannot rent another house and the bank does not lend me the money to buy a house because the salary is very low and I no longer have any property. I also have no family that can help me, I am desperate because I need to buy a house or we are going to stop on the street, my salary is barely enough to buy food and pay bills and rent. please help me, if i can buy a house to live on my low salary it will be enough to pay the bills and food and maybe i can even send my daughter to study at a university, she is currently in high school and i have no money so she can continue to study.