Called Selfish After Falling Down Stairs

My dad called me selfish after I fell down the stairs doing my sister's chores.

I came home exhausted from sports training, but my sister started screaming at me to do her work just

because she was on a call with her boyfriend. I tried to do it to keep the peace,

but I got a severe leg cramp, fell, and hit my head hard on the floor.

I still finished the task. When I asked my dad for support, he defended her.

He told me to grow up and understand her because she's older. She’s laughing at

my pain while he calls me immature. I feel completely broken.