Really? You seem like a perfect Shia extremist. I thought better of you but I guess I was wrong.
Those you call Saudis belong to the same ancient land (by blood - ancestry or birth) that all the major Islamic individuals do among them Prophet Muhammad (saws) all the Prophets before him, the Ahl al-Bayt, Sahabah, Caliphs, all Arab Caliphates and their dynasties (Caliphs) most of the scholars and many others. Not to say the 12 Shia Imams you Twelvers belief in - a fundamental part of your beliefs.
In fact all those Shia clerics you see with black turbans CLAIM to descend from Hijaz an ancient region in what is now KSA. Many of them also do.
The logic of some extremist Shias is astonishing I must say.
I guess your comment also includes the oldest SHIA communities in the world found in KSA too.