Your mil clearly needs more care than you, dh, and her daughter and partner can provide
Dementia is a complex medical condition and unless you are trained to care for individual with it, you could be doing the patient a diservice.
Her daughter and partner are not interested in getting involved at the same level of care that you are doing - and it is 1000000% ok
They are not forced to do so, it is not their responsibility
Your sil and husband do care about mil - not in the way you would prefer though
Please do not talk to her - it won't end well as you think she is not stepping up enough
Start arranging more residential care for your mil
What sort of family would you not want to marry into?
Professor Jason Arday - plagiarism etc
fiorentina.