Alids

The Alids () are an Arab community and a part of Ahl al-Bayt, found predominantly in the Arab world and the South Asian countries. Alids are the one who were accepted as the descendants of Caliph Ali ibn Abi Talib, cousin and son-in-law of Islamic prophet Muhammad, through all his wives (through some branches such as Alvis, Awans, and Sayyids including Hasanids, Husaynids and Zaynabids).
Lines of descent.
Primarily Sunnis in the Arab world reserve the term "sharif" or "sherif" for descendants of Hasan ibn Ali, while "sayyid" is used for descendants of Husayn ibn Ali. Both Hasan and Husayn are grandchildren of Muhammad, through the marriage of his cousin Ali and his daughter Fatima. However ever since the post-Hashemite era began, the term "sayyid" has been used to denote descendants from both Hasan and Husayn. Arab Shiites use the terms "sayyid" and "habib" to denote descendants from both Hasan and Husayn; see also ashraf.
To try to resolve the confusion surrounding the descendants of Muhammad, the Ottoman Caliphs during the 19th Century C.E. attempted to replicate the Almanach de Gotha (the tome listing the noble houses of Europe) to show known and verifiable lines of descent. Although not 100% complete in its scope (some lines might have been excluded due to lack of proof, although no false lines are included) the resulting ""Kitab al-Ashraf" (Book of the Sharifs)," kept at the Topkapi Palace Museum in Istanbul is one of the best sources of evidence of descent from Muhammad.
The Awans are descended from Ali's sons, Abbas ibn Ali and Muhammad ibn al-Hanafiyyah.
There are several dynasties of Alid origin:
Genealogical trees.
This is a table of the interrelationships between the different parts of the Alid dynasties:
Below is a simplified family tree of Husayn ibn Ali. For the ancestors of ibn Ali see the family tree of Muhammad and the family tree of Ali. People in "italics" are considered by the majority of Shia and Sunni Muslims to be "Ahl al-Bayt" ("People of the House"). Twelver Shia also see the 4th to 12th Imamah as Ahl al-Bayt.
Family tree of Hasan ibn Ali.
The Hashemites of Sharifs of Mecca, Kings of Jordan, Syria and Iraq are descended from the other brother Hasan ibn Ali:
The Alaouites, Kings of Morocco, are also descended from the other brother Hasan ibn Ali through Al Hassan Addakhil:
Genealogoical chart of the descent from Muhammad of the Idrisid dynasty, rulers of Fez and Morocco, Kings of Tunis, and the Senussi dynasty, founders and heads of the Libyan Senussi Order and Kings of Libya are also descended from the other brother Hasan ibn Ali through Al Hassan Addakhil.
Family tree of Abbas ibn Ali.
This is a simplified family tree of Abbas ibn Ali.