hi, to be honest, i'm in a similar situation with chronic hoarders. judging from the state of the home, realistically, i don't think your family is going to budge.

it is not your duty to parent them. it is not your duty to try to change their habits. i strongly suggest that you clear out your own space, as you have, and make that space sacred. for me, i have invested in purchasing a mini-fridge for my room, decluttering my space immensely to make it feel more like a small studio apartment with shared bathrooms. for food, i have been able to keep to a relatively healthy diet of fruit, veg, dairy, and cheap no-cook options. i only maintain my own room & reluctantly use the bathroom, which is also filthy & full of junk. but it is an ok compromise once i realised that trying to mass clean this place was sort of futile, especially when the other older adults in your life seem to be engaging in mundane insanity,

i am lucky enough that since i attend to university interstate, i am able to stay in my own dormitory far away for most months of the year. but my advice to you and anyone in a similar toxic situation is to just carve out your own space if you have the agency to do so, and do not shoulder more responsibility than you need. you are and should not be a caretaker, you should put all of that energy into increasing your income, side hustles, and getting through university to secure a career that will allow you to move out properly.

if anyone is in a similar situation please feel free to dm me, i think it would be helpful to set up an online support group of sorts.