When you brother muslim becomes ill, visit him.
Among the rights of the muslims upon the Muslim Is mentioned by the Prophet in his statement, "And when he becomes ill, visit him." Visiting the sick is from the rights of the Muslim, and especially for the person who has a highly stressed and emphasized right upon you, like the relative. It is from the best of the righteous deeds. And whoever visits his Muslim brother, he remains engulfed in the mercy of Allah until he returns, and the angels ask for forgiveness for him as narrated in the sahih hadith.