Bruce Willis is "so sweet" with his granddaughter.

The 'Die Hard' actor has retreated from the public eye after being diagnosed with frontotemporal dementia (FTD) but his daughter Rumer Willis has told fans he is doing "good" and she loves seeing him interact with her 13-month-old little girl Louetta.

Appearing on 'Today', Rumer said of her dad: "He's so good. I actually got to see him right before I came out [to New York].

"And Lou is just starting to walk a little bit, and she was walking over to him, and it was so sweet.

"It's so nice because I feel like my dad is just like - he's a girl dad, through and through. It almost unlocks that kind of little-kid, girl-dad thing. He's so sweet with her.

"I saw him with my sisters, my little sisters. So you’re seeing that all come back again."

In 2022, Bruce's family - including Rumer, her mom Demi Moore, sisters Scout, 32, and Tallulah, 30, as well as the 'Pulp Fiction' star's wife Emma Heming and their kids Mabel, 12, and nine-year-old Evelyn - announced he was retiring from acting after being diagnosed with speech and language disorder aphasia, with his dementia diagnosis then confirmed the following year.

And the 'House Bunny' actress explained it is "so important" for them to speak publicly about Bruce's health issues in the hope they can offer comfort and support to others in similar situations.

She said: "Our vulnerability and transparency as a family about what he's going through to me is so important because if it can have any impact on another family that is struggling in any way with something like this, or bring more attention to the disease in hopes of finding a cure or anything that can be of service to anybody else, I think is really important."

The 35-year-old star - who has her daughter with boyfriend Derek Richard Thomas - is touched by the outpouring of love and support she's had in the wake of her father's diagnosis.

She said: "People will stop me on the street or at the airport, wherever it is, and are so effusive about how much they love him, how much of an impact he’s had on them, or just that they’re sending love to our family.

"And it really makes me a proud daughter, honestly, to just see how much love he’s getting."