I understand your fear Nanny27 and do hope you and your sister can discuss the future care needs of your DM and find an acceptable solution. Sometimes resentment can build up between siblings when one is having to do far more than another (usually due to geography) but I am sure you are supporting your sister all you can and giving her a break whenever possible. After your Mum's days you and your sister will still have a relationship so it is essential to protect it as best you can. I came across this poem from Owen Darnell of Dementia Awareness and it really speaks to me (my Mum too is 93 and struggles with memory loss but has a long way to go on her dementia journey - if indeed she lives long enough to travel there). I send you my best wishes and strength for the times ahead:
"Do not ask me to Remember
Do not try to make me understand
Let me rest and know you're with me
Kiss my cheek and hold my hand
I'm confused beyond your concept
I am sad and sick and lost
All I know is that I need you to be with me
at all costs
Do not lose your patience with me
Do not scold or curse my cry
I can't help the way I'm acting
Can't be different, though I try
Just remember that I need you
That the best of me is gone
Please don't fail to stand beside me
Love me till my life is done"
John Healy has resigned as Defence Secretary



