Not sure what to do about this situation
I have 6 sibling, but I am the only one who helps my mom clean, takes her out shopping, and spends quality time with her. We have gone shopping together for the last 25 years, but now suddenly that she is diagnosed with alzheimers my sisters are questioning how she spends her money! Occasionally my mom will buy my gas and get me small things because she wants to repay me for all of my help. I would never ever take advantage of my mother and almost always refuse her when she wants to get me anything, but occasionally i'll let her get the gas because I drive to and from her apartment almost every day. I am so angry at my sisters for talking behind my back. I just don't know what to do. I already spoke to one sister and told her my mom has always spent her money that way, and she has enough of it to get her through her life. She is only in early dementia, and I want her to enjoy her life. She is 77 and deserves to have fun. Any advice?