Tallulah Willis continues to battle with her own grief as her father, Bruce Willis, battles frontotemporal dementia -- a progressive neurological disorder that impacts both cognition and behavior.Bruce was diagnosed with the disorder last year, and as a byproduct, aphasia, a brain-mediated inability to speak or to understand speech. Tallulah recently opened up about her father's health and her changing relationship with the star in a candid essay for . Speaking to ET's Brice Sander at the premiere of her new Fox reality series, , Thursday, Tallulah said she hopes that her words resonate with people.«I mean, the response has been so unbelievable, and I'm incredibly grateful, not only for the people that have reached out, but for and Anna and Rob and everyone that was a part of getting that there,» Tallulah said.