What is the ruling on bestowing the title "Sayyid" upon everyone who claims descent from the Prophet's household (may Allah's peace and blessings be upon him), including children, those who do not show signs of uprightness, or those who are innovators?

This title is used today to denote a person's lineage to the family of Al-Hasan or Al-Husayn—may Allah be pleased with them both. There is no harm in it if it is intended for identification, not glorification. The use of the term "Sayyid" for other than Allah is permissible, and the prohibition applies when it is used for self-aggrandizement, not for identification.