I see that this is an old post, but my grandfather (since passed ) was Fred Sinai (Fritz) born in Vienna in 1921. He was an only child of Berthold Sinai and Elsie Tischler. Berthold's father was Heinrich Sinai. That is as far back as I am at this point. My grandfather never spoke much of his past until the last decade or so of his life. He left Viennna when he was 14 and went to England before coming to the US and living in Chicago. My brother and I would love more information. I know that Berthold had several siblings and their offsprings are in Australia, Israel and Vienna.
Alayna Lerner