Our expert says:
Sit down and have a calm discussion with her about modifying the rules so as to suit you ( it's your home and you are paying for it, she is the guest there.). Surely if she wants to go ahead she should either take up more full-time studies ( mocne a week is a very minor course ) or get herself a job as well, which will both earn her money ( she can then take over paying for her courses ) and let her practice and gain real experience in administration and work. Just sitting round watching TV at her sister's expense, is not going to get her anywhere in life, except to teach her to be lazy and to sponge off others.
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