It might help us to answer more helpfully if you told us why you're not living with your mother and why your father and aunt have been away your whole life.
Are your grandparents your Mother's or your Father's parents? Is your aunt in your Mother's or Father's family? Have you told your Mother about the way your Grandparent's treat you? If so, what did she say? If not, why not?
Are you in school and does the school have counselors with whom you could talk?
I looked up employment requirements in Portugal. Teens can begin work at 16. If they have dropped out of school, they can begin work at 18. I wonder if your situation is difficult because the adults in your life believe you're not making responsible decisions. Perhaps they are frustrated, even angry. They don't know how to help you accept responsibility for your decisions.
Are you living with your grandparents because you and your mother did not get along? Now you also don't get along with your grandparents. Do you know that everyone involved in not getting along each has a responsibility to work together to figure out how to be respectful and live in that situation?
I suggest everyone is angry and would be helped with counseling to learn how to better talk with each other. There is no easy way to resolve what is happening. We only have control over how we behave. Perhaps there are some things you could learn that would be the beginning of making life better for you.
All teens rebel in some way. Often parents and grandparents don't know how to get along with their teen. If you and your grandparents were able to set aside anger long enough to calmly talk and really listen to each other many situations can be changed. This is why I suggest counseliing.
Of course you're upset and angry. You feel they don't care about you. They may not. Consider that they may care and don't know how they can show you love. They did not have to agree to you living with them. I suggest that if they didn't love you they would not have you living with them. Do you love them? It's hard to feel loved when we don't get along.
Why do you ask if it's right for your mother to pay them when they don't care? There are two meanings to the word care. Your mother pays them for your physical care. Providing your basic physical needs. A place to live, providing a place for you to live and your physical needs such as food, personal care items, clothes. The money also pays for the increase in household expenses such as electricity and hot wster.
Your mom does not pay them to care. The money pays for food and doesn't require they buy food you want. So it's pointless.for you you not to eat. I suggest that you're hurting yourself when you talk about money. How much your Mother pays is her choice. How much your grandparents ask is and.how much she pays is an agreement amongst the three of them. The money has very little to do with how they treat you. So leave money out of your complaints.
You want them to treat you in a way.that shows you they care. You probably feel powerless. Stop fighting about money. Know in your mind that you feel powerless. Sounds like you have no power or their decisions that negatively affect you. Know that you have power in how you respond to them.
You are doing the best that you can in this situation. Recognize that they are also doing the best the can in this situation. This situation is very painful for all of you.
I pray that you can find help in learning how to react in a way that gets you what you want. You can only control.what you do and say. You can't change them. However,.what you do and say may change some of what they do and say to you
Change is very difficult. Few people are able to change on their own. We need.help. when we aren't getting help at home, professional counseling is the next place to go.
My 18 yo granddaughter has lived with me for 4 years because she didn't get along with her parents. My granddaughter wouldn't go to counseling and so I did. I saw her change as I changed. We get along most of the time in part because I changed what I expected from her. A counselor can help you know what to do in your situation.