Fleurpepper
Sorry Hazel, but your first sentence was that your sister is your mum's carer.
You perhaps have no idea how much 'resentment' there can be, when one sibbling does all the day to day caring, and others just phone once in a while. Blunt, yes- but the reality.
Yes to this.
I’m not my mum’s carer because she lives in a care home. However I visit several days a week, get anything from the shops she needs, liaise with her care home staff and doctor regularly, am selling her flat, have sorted out her flat, manage her finances. My sister phones when she feels like it. Sometimes no calls for weeks, when she’s annoyed with mum, other times three calls a day. We don’t communicate because sister’s mental illness makes her extremely nasty at times. I get on with it. It is what it is.
Maybe your sister feels the same. Perhaps show a little more interest, and visit sometimes. Apologies if you already visit. Phone your sister and communicate with her.