Tallulah Willis needs to feel “solid” before she sees her dementia-stricken father. The 30-year-old actress daughter of Hollywood veterans Bruce Willis, 69, and Demi Moore, 61, suffers from autism and is recovering from a skin-picking disorder and has now opened up about how she needs to feel in a stable mental state to visit the ill ‘Die Hard’ actor as he continues to battle his degenerative condition. She told People: “(I need) to go into (the visit) open to what the visit is, and knowing that before I go in, I’m solid, I’m okay. “I’ve done what I need to do to make sure that I can just be p…