ANSWER: She is sinful for threatening him with such unislamic things and for not sufficing him sexually but she has no sin in whatever sins he commits as he is an adult and accountable for his actions.

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ANSWER: No you will not be sinful as these things are voluntary and not mandatory such as prayer and hijab.  However try to deal with her with love and in a diplomatic way so that she does not get offended when you remind her.

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ANSWER: Advise her to sit at home so that he can man up and take care of his responsibilities.  She is not obliged to provide for the household as that is his job. You can be the man of the house, work and earn and make your mom sit home and not work. 

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