I'm replying to myself to lay out the timeline of Yvonne's death, since that is when people claim this switch happened. So first Yvonne's husband Joseph request

I'm replying to myself to lay out the timeline of Yvonne's death, since that is when people claim this switch happened. So first Yvonne's husband Joseph requested leave from the military and was granted it because his wife was sick, we have the record of that from the military. There is a picture of Yvonne at a sanitarium for TB patients around this time period, further establishing she had TB and was ill. Then the priest administered last rights and Yvonne died. There was a funeral mass that many people attended and a viewing of the body at the family home. This is in newspapers from the time. There are no accounts of Jeanne being ill in this time period. So for this switch to have happened we would have had to have the daughter sick, then the mother secretly gets sick just in time for the daughter to recover. The mother dies and they come up with this plan to dodge taxes, even though presumably it would be risky and Joseph could lose his position as an officer in the army if they are caught. They get the town's doctor, priest, and newspapers to go along with the fraud. All of this to avoid a tax of about 6% of Jeanne's wealth, a considerable sum but do you really think it would be worth all the risk? At the end of the day, because of her status as the world's longest living person Jeeanne's life has been studied mroe then any other supercenturginarian, and no one has ever found proof that anything happened. We have census records from multiple decades, marriage and childbirth records with the government and church, and multiple mentions in newspapers.