After he died in 1526, his son-in-law Annibale della Nave inherited this notebook, who was also a mathematician and married to del Ferro's daughter, Filippa.
Following the death of del Ferro in 1526, his son-in-law, Annibale della Nave, took possession of the notebook.  Annibale was a mathematician and was married to del Ferro's daughter, Filippa.