Struggling to Care for Family Despite Past Hurts

Assalamu Alaikum, everyone. I wanted to share something that's been really tough for me lately. My father has been a difficult person to deal with-he's emotionally harsh to my mother, doesn't put effort into life, and talks about Islam but doesn't really follow it himself. For almost ten years, he's been without work and seems to have given up on himself, spending most days just watching TV, eating, and resting. My grandmother was also very hard on us when she was healthy. My mom told me she’s had mental health struggles most of her life. She often accused family members of terrible things that weren’t true, causing a lot of hurt and division. She was abusive in many ways to my grandfather and aunt. A few months ago, both my dad and grandma ended up in the hospital the same day. My dad suffered a stroke, and my grandma had a bad infection made worse by dementia. Now she’s bedridden, and although my dad is improving, he’s still weak. Since we live far from them and other relatives, we've had to travel back and forth to care for them both. As Muslims, I know we have the duty to care for our parents and family, but it’s hard to keep resentment away when I remember how badly they treated me before and even now. My dad has slipped back into laziness, but now he’s even more demanding because he can’t do much himself. We tried hiring help, taking him out, encouraging exercise (something he never did before), but he blamed us for his hospital stay, saying my mom’s late nights disturbed his sleep and caused his stroke. He ignores factors like his diet and inactivity. I moved into my mom’s room to help with him, but he wakes us up at night over small things. I was studying for an important exam and applying to grad school when all this happened; I ended up failing and delaying my applications. It feels like my life is on pause. Even praying Fajr has become difficult. I struggle with anger and sadness toward both of them for what they’ve done and continue to do. My mom is like a superhero-strong and patient-and I worry about what I’d do if we ever lost her. My iman has really been tested. I used to find comfort in prayer and Quran, but now I force myself, and the peace I once felt is gone. I know this is a test from Allah, but sometimes I get angry at Him, and I know that’s not right. Honestly, I’m just exhausted. If anyone has advice or kind words, I’d be grateful. I’m feeling really low and could use some understanding or to hear if others have faced something similar.