Is it permissible to issue a maintenance deed to obtain health insurance for parents, given that they have a modest retirement pension and that the son and his brother sometimes spend on them, and they are in dire need of insurance due to the high costs of treatment?

If health insurance is forbidden, then it is not permissible to subscribe to it except out of dire necessity, such as inability to bear the costs of treatment. However, if the insurance is permissible, or if you are compelled to use it while it is forbidden, it is permissible to obtain a document proving that you are the breadwinner for your parents if you bear most of their expenses. Otherwise, it is not permissible to resort to deception to violate the terms of the contract.