Ability to change relation to head of household
Add ability to change relation to head of household. My 3 greats grandmother is listed under her son in law as his mother.
As soon as the 'edit every field' indexing app is released for this 1920 Census image you will indeed be able to edit the indexed relationships. Julia is correct though - you would need to note it as a correction to what was in the document. I am not certain at this time how the new 'edit every field' indexer handles amended/corrected annotations and whether sources/proofs can be linked. The simplest thing is to add such into Notes as Julia describes.0
I'm sorry, but none of us have access to a time machine, so we cannot correct this census. It will forever say that Nancy Wapaha was Eugene Hoffman's mother, because that's what the enumerator wrote, a century ago.
What you can do is to make a note on Nancy's and Eugene's profiles, when you attach the census as a source, indicating that the relationship is incorrect.
(It looks like another user took the census at its word: https://www.familysearch.org/tree/person/details/G9XM-KYY.)0