Heming Willis shared it is unclear if her husband is aware of his condition.

Heming Willis said she calls herself a "care partner," rather than a caretaker.

FTD is often misdiagnosed, so Dickinson shared some of its most notable symptoms.

"It's teaching them so much and how to care and love, and it’s really a beautiful thing amongst the sadness," Heming Willis said.

For those concerned that they have or know someone who has FTD, this frontotemporal dementia diagnostic checklist can help.

Learn more about AFTD's World FTD Awareness Week activities, which run from Sept. 24 to Oct. 1.

The couple have two young daughters. Bruce Willis, 68, has three adult daughters with his first wife, Demi Moore.

“Just being in the know of what is happening to Bruce just makes it a little bit easier,” she added.