he told my mom he made a mistake while in the army. He had a affair. Dad does not make much sense when he speaks and says only a few words, so I think Mom may have helped him with this conversation. Is it common in the late stages of dementia to confuse the past. He also says things that he would Never had said before, comments to Mom, the nurse and aides. Mom is so upset with the comments and he seems to smile or laugh when this upsets her. This is nothing like my Dad. This affair would have been when he was 18 yrs old and he is now 80. I don't believe this would be true, but think it's the disease. He can't tell you what he just ate or if he ate. I would really like to know if there is anyone else out there that has had this happen. These lies are so hurtful to Mom who has been his full time caretaker. I have tried to help her to see this is the disease and not to let 60 years of good marriage be ruined by a possible lie that he doesn't know he is saying. Help!