my friend needs help .

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i hav a friend her son has started college and has really good grades .but the son meet new friends .he is starting to stay out late and has started drinking and partying with these's friends. she has talked to him and so has his father nothing they say is helping with the problem .she is concerned that her sons grade will be affected and concerned for her sons health and future , do any of you have any advice on what she can do to help her son .she wants him to stop drinking . i have said to stop all his moneybut she is worried if she does this he will drop out of college, she does not want him to drop out of college . he is of age so naturally she can not tell him what to do . but she is worried sick about her son . please any advice to help her.