What was done and how quickly it was done once my father was in hospital and hospice for good?

My father recently died. He had dementia, yet has been fighting this awful disease for about 1-2 years, in addition to several mild strokes. Recently in February, his youngest child had him sign a living will, in addition to adding his name to it, to the title of home, etc. I know that my father was not well. He claimed to me that he was the one in power now and that my parent’s home was now his. His name was also added to the checking account. I question just about everything. Your thoughts are greatly appreciated.