Hi Steve, I updated your findagrave link to the new findagrave one
Under the changes tab, you can see that Susan Tye added information on Thomas Maynard's marriage. Remove the reference for the Iowa marriage a it relates to some other Thomas Maynard, not yours.
Step 2, on Thomas Maynard's profile, go to the spouse's link and remove the wrong spouse. Click on "add/remove spouse" At the bottom of the add/remove page, click on the wrong wife's name and then delete spouse.
Step 3. Make sure any children Thomas Jefferson Maynard has stays with him and doesn't migrate with the spouse being removed.
Step 4. From familysearch search under Thomas Jefferson Maynard's birthplace and date and his marriage date and place, as there is an 1880, a 1900, and I believe a 1920 Census that needs to be added.
Step 5. Add his correct wife. If you don't have the relevant info on her, Thomas J. Maynard's findagrave link has a link to Mary E. Marshall's findagrave link.
Once you added her, go back to the census reports and add them to her profiel.
The way to do it correctly is step by step.
e-mail me if you have problems.