Tallulah Willis has a message for the person talking about her father's health behind the family's back.

Bruce Willis's youngest daughter fired back this week after reading an article that quoted an unnamed source. That person claimed the actor "acts like a baby now."

Bruce stepped away from acting after he was diagnosed with aphasia. He was later diagnosed with frontotemporal dementia.

"Who are you?"

Tallulah did not hold back in a social media post.

"It struck me because the people who love him throughout the world have expressed to me, when I've shared photos, that there should be real, discernible mindfulness on what is posted," she wrote.

Then she went after the source directly. "So the 'friend,' 'family member,' or source who shared that he 'acts like a baby now?' How is that acceptable? Who are you?"

She closed with a warning: "Stay away from my family."