My sister, Executor of our parent’s will, has not let our mom have her social security check of about $1,100 per month, since dad’s death over two years ago. There are several hundred thousand dollars in the estate and mom’s home is fully paid for. I left my 20+ year job in NY to care for mom in PA so she could stay in her home. I am the main caregiver and sole provider. I work nights for $11/hour to care for mom during the day and take mom to my sister’s on my work nights; sis works days. As mom’s condition continues to deteriorate, she needs more help with bathing and dressing. As her son, I am uncomfortable helping mom with those but on our limited resources we can’t afford to hire help.
Sounds to me like their is plenty of money for your mother's care which means that you really didn't have to quit your job. Are you durable and medical POA for your mother or is your sister.
What your sister is doing is wrong. Tell her to stop of you will report her theft to the police and you will get a lawyer to prosecute her to the full extent of the law. Take no prisoners despite her being your sister. Look after your mom and yourself.
Also, your mom really needs female help since you are her son. Don't spend your mother on her care. Spend her money on her care, You said she has several hundred of thousands.
Time to play hard ball with your sister!
Does sister hold Power of Attorney? Have you considered leaving and going back into the job market , and letting your sister deal with mom's needs? I think that might be a good plan for you.
I might engage the services of an Elder Law attorney. Have them send the bill to Sis.