(CNN) — Emma Heming Willis is opening up about the challenges facing her husband, Bruce Willis, as he lives with frontotemporal dementia.

Three years after Willis , his wife spoke with ABC’s Diane Sawyer for

According to the , frontotemporal dementia (FTD) is an “umbrella term for a group of brain disorders that primarily affect the frontal and temporal lobes of the brain. These areas of the brain are generally associated with personality, behavior and language.”

Heming Willis told Sawyer that Willis is generally in good health at the moment, but it is “his brain that is failing him.”

“The language is going, and, you know, we’ve learned to adapt,” she said. “And we have a way of communicating with him which is just a different, a different way.”

The couple are parents to two daughter

See Full Page