Thanks for the reply, Al.
I have, over the last twelve years, discovered the answers to most of the questions I posed in my original post. As an FYI, Johannes died a little over a year after his marriage to Lavenia. Anecdotal data suggests the cause to have been appendicitis.
Louisa was their only issue, though Lavenia did marry again (David BOOTHE), of Gonzales) and produced two more children (Job and Margaret Elise).
After looking through the information you shared, I'll get in touch with you via private mail if I have any further questions.