Tallulah Willis wants to use her family’s struggles to “help other people”. The 30-year-old actress – who is the daughter of ‘Die Hard’ star Bruce Willis and his ex-wife Demi Moore – and after her father was diagnosed with frontotemporal dementia (FTD) just over two years ago, she and her family have found it “really special” to use their public platforms to “spread awareness” of the degenerative condition. Speaking on ‘The Drew Barrymore Show’, she said: “What’s going on with my dad is that he has a really aggressive cognitive disease, a form of dementia that is very rare. “I think [being ope…