François Arago [SEP] educated at
the entrance examination of the École Polytechnique. Within two years and a half he had mastered all the subjects prescribed for examination, and a great deal more, and, on going up for examination at Toulouse, he astounded his examiner by his knowledge of J. L. Lagrange.
Towards the close of 1803, Arago entered the École Polytechnique, Paris, but apparently found the professors there incapable of imparting knowledge or maintaining discipline. The artillery service was his ambition, and in 1804, through the advice and recommendation of Siméon Poisson
Marie Arago
Marie Arago, born Marie-Anne Roig (3 November 1755 – 5 September 1845) was a French woman, wife of François Bonaventure Arago and mother of François, Jean, Jacques, Victor, Joseph and Étienne Arago.
She raised her eight children alone after the death of her husband in 1814, passed on her human values and encouraged them to pursue their studies. 
An "Arago clan" was formed around her eldest son, François, at the Paris Observatory, including Claude-Louis Mathieu