Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) forbade marrying a woman together with her paternal aunt, or her maternal aunt, or her niece (brother’s daughter), or her niece (sister’s daughter). The Prophet Muhammad (peace and blessings be upon him) also forbade marrying the younger (sister) together with the elder, or the elder together with the younger.