What is the Sharia responsibility of a brother towards his sister? Is it limited to food, drink, accommodation, and advice? Is it permissible for him to leave her alone and visit her for only two days a week? Is his visit considered a favor from him rather than a responsibility?

The sister is among the close relatives with whom maintaining ties is obligatory. This includes visiting, serving, and assisting. Neglecting kinship ties when one is able is disliked or forbidden depending on the situation and custom. Maintaining kinship ties means showing kindness to relatives through money, service, visits, and greetings. The levels of entitlement of relatives to these ties vary, with the closest being given priority. The forbidden severing of kinship ties is mistreating relatives or abandoning the kindness that a relative has become accustomed to without a legitimate excuse, and this is considered a grave sin. A brother's visit to his sister is obligatory and not a favor, and he is not permitted to cut it off without an excuse, due to the estrangement and aversion that results from such an action.