Islam follows the teachings of the Quran and the Hadith (sayings and actions of the Prophet Muhammad), which clearly prohibit incestuous relationships. Muslims are required to follow these religious teachings, and marrying a close blood relative, such as a sister, is a severe violation of Islamic principles.
It is essential to avoid generalizing or propagating misinformation about any religious or cultural group. Marrying siblings is not a common or acceptable practice in Islam or any mainstream religion. Muslims, like followers of other faiths, are bound by societal norms, laws, and religious teachings that uphold the sanctity of marriage and family relationships while strictly prohibiting incestuous unions.