Compare and contrast sources about Fermat

When looking at the variety of sources of Fermat there is little that is disagreed upon. Some sources go more specific than others, specifically about his education, while others just give a general location. Whether this is wrong remains unknown, however all the sources that do pinpoint locations remain consistent with one another. Additionally the credibility of these sources also provide the sense that they are correct.  One uncertainty I came across upon reading the sources was whether Françoise Cazeneuve Fermat, was Fermat's true mother or not. While some sources seem positive on the internet, the more credible sources I used in older posts refused to make this an absolute. Another uncertainty arose from the MacTutor History's page on Fermat by questioning his birthday. Apparently Pierre de Fermat possibly had an older brother named Pierre who died young, consequently causing the mathematical Pierre de Fermat's actual birthday to be recorded incorrectly, and his older brother was actually the one born on August 17, 1601.