Mil's mum had Alzheimers when she died &her dsis developed it in her 50s. Mil is now late 60s &showing symptoms herself but I really don't know what to do. She has always been a bit funny with sudden changes to plans, forgetting conversations so she has possibly been 'hiding' behind that for a while but it's definitely getting worse. DH will be reluctant to have the conversation with his DPs & MIL is not going to take the suggestion she see a doctor well. How do we raise it without causing a massive offence/argument etc?