My mother is 94. She was a horrible person when she was younger and has only gotten worst.
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Of course, my husband always claims I don't understand him, I take things wrong, and the accidents are just accidents. He also claims he has a "bad memory", and simply can remember when I ask him to do things. Went with him to his doctor, explained how his abusive behavior worst was getting worst-not believed. But doctor orders memory testing.
Because he claims he has memory problems. Testing shows his memory is excellent! Much better than most in his age group. But the testing also shows extreme hostility, paranoid behavior, etc.-close to being diagnosed as mentally ill, dangerously mentally ill. The report suggested he get anger management, medication, and on-going therapy. Complete validation of what I had been saying for years.
From early in our marriage, I suspected he might be a family annihilator. If you have a relative who is getting worst, you might consider memory testing. The testing is not just for memory issues. The way I got him tested was to agree with his concern for his memory even though I realized it was fine. His doctor was shocked at the results. I was not.