Pick you fights

I was speaking with a neighbor the other day about her frustration with her husband and his memory loss. You see, this gentleman has been diagnosed with Alzheimer's and has reached that stage in the process where he is argumentative and suspicious. She is finding it harder and harder to hold things together.
My suggestion to her and to anyone else with the same challenge is to choose your battles. Ask yourself if the issue is going to be important in 5 years. Is it a matter of safety? How about economic health? Also, allow some space for a topic to cool off to avoid a major conflict.
Some times you also need to agree at the moment and then do what needs to be done when the person forgets the topic ever came up. This will take a delicate touch but it is worth it to develop the ability to tread lightly when needed and take charge when you can.