I found with people with dementia respond much better when you just agree with most of what they say, responding negatively seems to exacerbate their behaviour. I'm sure you probably know that anyway, I'm sure your sister will be so grateful and knowing that will get you through..
To soap or not to soap? Light hearted.
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Things said in a positive tone seem to encourage a positive response - hard work but worth it for the time you are there. 
