From EJ - Ezekiel Landau's sons were JACOB (known as JACOBKE; 1745 or 1750–1822), who was ordained rabbi but was friendly with the Galician maskilim. After living in Hamburg for a time, he settled in Brody, where he became a prosperous merchant. Some of his novellae on the Talmud are included in works by his father and other contemporary authorities. He also contributed to Bikkurei ha-Ittim . - as in here)
1 - To obtain Eichorn's bibkiography of biblical literature.
2 - omething more complicated. More on the book - a reference to the fact that he is descended from the great Landau. Inquiries about the ms, of Rambam, and the genealogy of the Shlah?