[1] He was the son of Juan Vicens Comas and Victoria Vives and was born on the Santa Eugènia road, number 5, in Girona.
His father had arrived in Girona at the end of the 19th century and worked as a proxy in the factory La Farinera Ensesa.
His father died suddenly in 1922 and his mother moved to Barcelona in 1924, where she had more opportunities to support her family by working in her profession.
In 1926 his mother remarried and the bad relations between Jaume and his stepfather led him to leave the family home when he was only 16 years old to live in a boarding house, paying for the completion of his secondary studies with a job as an accountant in a department store.
[1] That book was to have been originally titled Nosaltres els catalans, but it was renamed under Josep Pla's advice,[2] for fear of Francoist censorship.