Wow, your mother sucks. She is way beyond any reasonable demand. Go to job interviews, find a friend or a neighbour to replace you as a sitter for the interviews, and get the dream job. Then go away through college housing accommodations (they must have something). And babysit your siblings when you feel like, at the pace you can manage with your job and your education, like once a fortnight. You seem full of energy and skills, just do the next step toward emancipation.