Help! I entered a son's mother as his wife. How can I change this? I'm not getting any help from the software.

In the People Workspace, Find and select the wife. Then on Pull Down Menu item "Person" select "Attache/Detach Person" then "Detach Selected Person".

Now navigate to the Son. With Him selected, Again pull down the People Menu, select "Attach/Detach Person" then "Attach Mother" and select the correct person from the list.