Perhaps you should talk to your grandmother about this. She appears to be the family genealogist.
However, I would question her research. Verify for yourself that the information is correct and not a leap of the wishful thinking. I find it very odd that Bouvier was changed to Brodeur. Perhaps she meant there is a Bouvier in the ancestral tree that MAY be connected to the Jackie O. Bouvier lineage. You would need to research Jackie O's ancestry to prove the connection.
Diane, your memere, has cooresponded with me in the past. However, she did not tell me her detailed marriage date, location or parents for both herself and husband "Bud".