Heart goes out to you Racer. Navigating this will be a challenge for anyone. We are here for support and venting. There is still a chance that your mum will recover more than present situation too. Sending healing vibes.
You’ll need to be there for your dad too - sounds like he might need someone to model how to be human/emotional too. Which is lot to ask but there’s not a chance in hell that he’ll seek outside professional advice methinks.