أعوذ بالله من الشيطان الرجيم

بِسْمِ ٱللَّٰهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ

As Salaamu Alaikum Wa Rahmatullahi Wa Barakatuh,

We hope this answer reaches you in good health and Islamic spirit.

Based on your specific question and information provided.

The Islamic Scholars have divided the Islamic teachings in three parts.Fundamental of Faith ( Belief / Aqidah), Islamic Ethics / Morals, and Islamic Law/ Fiqh / Jurisprudence. The “Institution of  Marriage” is covered by all three. The “Marriage Contract” is cover by Islamic Fiqh/ Jurisprudence.

Sayyid in Jurisprudence terminology are the descendants of  Hashim ( Hashimi).

In terms of Jurisprudence you are asking about the “Marriage Contract” between a  Hashimi and a  Non Hashimi. ? Jurists responds with the Jurisprudence definition of Sayyid ( Hashimi)  in mind.

From Jurisprudence perspective: The “Marriage Contract” is Mubah ( Optional / at your discretion).

From the Fiqh point of view , Part of the Khums is for Sayyids,  Zakat / charity is forbidden on Sayyids from non Sayyids, Sayyid woman marring a Non Sayyid the descendants will be from the Fathers side (Non Sayyids).

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What you are probably referring to is : The special lineage within the Hashmi. Sayyids in common religious understanding or Aqidah. (Syed / Sayyid  / Sadat) are the direct descendants of Muhammad Al-Mustafa (Peace be upon him and his pure Progeny)  thru Sayyida Fatima al-Zahra (sa) and our master Amir al-Mu’minin, Imam al-Muttaqeen ‘Ali Ibn Abi Talib (عليه السلام) . (Surah 108 Al-Kawthar).

The direct descendants usually marry with in the lineage and they have been keeping their family tree going back to the Imams(as). They consider it to be a  blessing to be born in this lineage and they try to keep their lineage pure. This is not a Fiqh / Jurisprudence matter, No Taqlid is allowed. They base their understanding (Aqidah) on  Surah 108 Al-Kawthar and Verse of Mawadda (42:23).  It is up to you and your family to discuss these and other matters  with the scholars of Aqidah / Ethics and  who are well versed in the matters of Maʿrifa and Mawadda and formulate your view / preference accordingly.  ( The institution of marriage is an Aqidah issue ).

والله العالم‎
(and Allah(awj) Knows best)

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