The information you give came from me but I was wrong. You'll understand why. This Cazzaniga was not the son of Lodovico Cazzaniga and brother of FG Cazzaniga; he was the brother-in-law of FG Cazzaniga, whose wife's maiden name was also Cazzaniga! I was corrected on this point only three days ago while at lunch with two of FG Cazzaniga's children, Carla and Claudio.
Thanks andrewandsally. We certainly do understand why and it is wonderful to fine-tune and correct details like this. It is what HelpMeFind is really good at.