<prompt> Human: Hi rpersonalfinance,I have a problem that I am trying to work through and I could really use some advice. My sister is in college and does not understand the concept of money. I am the older sibling of the two of us. My parents have not been the most financially responsible over the years, thus I feel a personal obligation to help my sister where my parents cannot. A little bit of backgroundshe is a 20 year old college sophomore. My parents have never forced her to work throughout the school year bc she is very involved in her extracurricular activities, particularly marching band. I personally think that she could get a job in the off season, but my parents do not push the issue. The two of us have very different personalities, which is not necessarily a bad thing, we just think about things differently. Ever since I was old enough to have a job and make money, I have held a job. I worked several part-time jobs throughout college and I now make a good living as an accountant go figure haha.I have seen my sister make money, but spend it as soon as she gets it. It worries me sometimes bc she likes to spend money, but she does not make any money to supplement that spending. Last year she overdrew her account several times and my parents were getting really frustrated.Around Christmas time, my parents asked me to help monitor my sisters spending. I had a serious discussion with her about how she needed to start buckling down with regard to her finances. My parents do not have the money to bankroll her and she seems to think that they do. I suspect that she is friends with affluent kids, who may not have the same sort of background that we do. She loves to buy name brand items and I think her self-worthself-esteem is in some way tethered to her material possessions.Around January, her college cut her a check for around 1,500 dollars i.e., student loan money, which she needed to pay for books and other necessities. I watched that money drain rather quickly, within a month of getting it. One day she had around 500 in her account and I checked her account the next day and it was down to 300. I saw that she spent around 200 for a dress a singular dress. Needless to say, I was furious. I had had a talk with her over the holidays about her being more financially responsible and it felt like the words went in one ear and out the other. She also got her first tattoo around that same time which was 80. And then she spent around 90 to fund her Spring Break tripall within the same week. Luckily, she does not yet have a credit card, but I certainly fear for that day. I will say that she worked harder to ensure that she has a summer job this year. She will be a lifeguard and will be making a good hourly rate. She should also be getting a fair amount of hours. As a favor to my parents, I have signed as a guarantor for my sisters lease next year she is moving off of campus. The rent is pretty minimal and I would be able to help her out if needed, but I really would like her to save her money this summer to ensure that her rent gets paid and that she does not waste the money she makes on frivolous things. My question to you is:-How can I teach my sister financial responsibility?-I have access to her bank accountshould I put the money that she makes this summer aside in a savings account for her? Should I implement a monthly allowance? This seems somewhat juvenile, but she has proven to me on several occasions that she may not be able to monitor her spending on her own.-How can I help to alleviate her need for impulse purchases? -Has anyone had any experience with this or gone through a similar situation? How did it turn out?I am posting this because 1 I care about my sisters well-being and 2 if she does not learn financial responsibility, it could negatively impact me given that I am the guarantor of her lease next year. Granted, I have the ability to pay for her rent if needed, but I do not wish to do so. Any advice is greatly appreciated. Thank you!  <response>: Why would she dial back on her fun spending if someones always there to bail her out? 