If you're feeling a bit old read this. It's about a book - The Lurie Legacy - on a family that's very, very old:
In "Legacy," [Neil] Rosenstein links the Lurie lineage - which includes such modern luminaries as Sigmund Freud and Martin Buber - to Rashi, the 11th-century sage, and many other revered Jewish figures from Hillel to Hezekiah - and ultimately to King David of the 10th century BCE.
.....
The family tree boasts an astonishing array of celebrated historical figures from the prophet Isaiah to Sir Isaiah Berlin, from Felix Mendelssohn to Karl Marx and Moses Montefiore.The list also includes Yehudi Menuhin, Helena Rubinstein, the Rothschilds and even Rosenstein himself. If it begins to sound like a "Who's Who" of the Ashkenazi world, that's because it is.