My father was admitted to hospital for a heart attack, then fell and broke his hip while in the hospital. waiting for tests. What is his recourse?

My father had hip surgery and then lived in rehab facility for 3 weeks to start walking again. he is now home, but my mother is getting overworked caring for him now. She has to help up out of bed and dress , bathe and bathroom duties. how can we be sure we don't get billed for any of his surgery or rehab care, and also get my mother home help in caring for my dad now.