It is possible that:
* They did not have children together. While there are many historical records of their lives, there is no mention of offspring.
* Information is missing or incomplete. Records from the 19th century, when Hall and Walsh lived, may not be readily available or may have been lost.
If you are interested in learning more about their lives, you can research historical records or biographies. However, it's important to note that information about their family life may be scarce or non-existent.