My mom has been in and out of the hospital and nursing homes since June 2016. My sister asked her for $4500.00 to buy a car while she was in ICU and on heavy pain killers. My mom agreed. I discussed it with her and she was apprehensive to loan such a large amount to her. So, she told me not to give it to her. My sister only calls or comes to see her when she needs money and mom always gives it to her because she is a single mom and struggling with two boys. My mom has given her $8,880.00 in the last year. My brother gets money whenever he needs it too. What can I say or recommend to my mom when she changes her mind and wants to give her the money?