Question: Who is the son of the man to whom Marie-Thérèse Walter was a mistress?
Sentence (from "Marie-Thérèse Walter"): Marie-Thérèse Walter (13 July 1909 – 20 October 1977) was the French mistress and model of Pablo Picasso from 1927 to about 1935, and the mother of his daughter Maya Widmaier-Picasso.
Relevant evidence: Yes