I am Syed Abbas Ali and belongs to the family of Imam Jafar Sadiq. Basically My grand father had lost a major portion of our shajrah while migrating to Pakistan, and only a part containing 10 generations before me is left with him.
None of his children (my uncles and my father) tried to complete it and he died when I was 2. My Far related grandfather (3rd Cousin to my grandfather) told me that My grandfather did tried to get the whole Shajrah back but was failed in this attempt as those of our relative in India and Lahore refused to provide us with that in fear of some sort of Property.