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If the business is still operating, the court would not relieve him of his liability to pay maintenance just based on his disability. As long as the business is running, he has income from the business and the court would order maintenance to be paid from that business income. If he is able to run the business, then he could not be considered totally disabled. His disability could prevent him from performing certain tasks, but as long as he is able to operate and manage the business he would not be considered disabled. If he cannot operate the business and has to hire someone to do so, then the income he gets from the business would be passive income and he could claim disability.
HOWEVER, even if he cannot physically run the business and just receives passive income from the business, this does not relieve him of his obligation to pay maintenance and the court generally will order him to pay from his passive income from the business.
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