"At the same time, a liaison with his landlady in Nancy led to the birth of a son, Serge. When a few years later Grothendieck sought to care for Serge himself, he embarked upon a custody lawsuit that had little chance of succeeding. But this was only the beginning of his chaotic family life: in all, he had five children by three mothers, and would be as absent a father to them as his own father was to him."
A really cool stream.