Why Bruce Willis' family has been so candid about his health battle

Bruce Willis' family wants his fans to learn from his health battle.

Nearly a year after sharing that the "Red" actor was diagnosed with frontotemporal dementia

his daughter Tallulah Willis explained why the family—including her mom Demi Moore,

stepmom Emma Heming Willis and sisters Rumer Willis and Scout Willis—have been so open about his condition.

"I think on one hand, it's who we are as a family," she said on the Nov. 8 episode of The Drew Barrymore Show

"But also, it's really important for us to spread awareness about FTD.

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