My granduncle is 70 Y.O. Since last 4-5 months, At any point of time, he starts talking like he is not in the current world. Whenever he goes any new place, he talks like he is in his office and starts talking something like "How watchman allowed to enter in the office", although that was our new home. Sometimes he says how I came to Mumbai? But whatever he talks, is relevant to his history somewhere. We have so many tests and visited to doctors, the problem couldn't be figured out.