In this case there are two deceased wives listed. How can I add both of them under the same record/name?
You would only index the most current wife unless the project instructions specifically say otherwise, which would be very rare. Here is the Help Center article:
When the document lists multiple spouses or parents, index only the current spouse or parents. Here are some quick guidelines for these situations:
But this does not work when the children are of a previous spouse - either deceased or divorced. The children would be added with an incorrect parent and ancestor tree. Or there are children from more than one spouse.
It does work for the purposes of indexing. We are creating an index to make these names searchable so that they can be found and the images acquired. What the researcher does with the information on the image is up to them.