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I guess it partly depends on what you want. Some people might just sit on their butts and get whatever they want, but maybe they don't want much. I personally wouldn't want to be financially dependent on my mother, even if she was willing to support me. She'd want to be in my business all the time and telling me what to do and stuff. I'd rather have my own money and get to make my own choices, even if it means I have to work for it.
Please note: I AM NOT A DOCTOR. If you want medical advice, talk to your doctor. Whatever I post, there is probably some surgeon or other health care provider somewhere that disagrees with me. If you want to know what your surgeon thinks, then ask him or her. Check out my blog.
As an adult, I would never want to depend on anyone to support me but myself and my husband. I am very independent however, should my friend choose to live that way it is her business! As long as it doesn't affect me and my household I wouldn't be worried. You should be happy for your friend that she is having WLS.