Early in the first book, the Atreides family take up residence on Arrakis. While unpacking and settling in, Jessica has been discussing where to hang a portrait of Leto's father:
Jessica turned away, faced the painting of Leto's father. It had been done by the famed artist, Albe, during the Old Duke's middle years. He was portrayed in matador costume with a magenta cape flung over his left arm. The face looked young, hardly older than Leto's now, and with the same hawk features, the same gray stare. She clenched her fists at her sides, glared at the painting.
"Damn you! Damn you! Damn you!" she whispered.
And in an earlier exchange with Leta, she tries to persuade Leto not to hang it in the dining hall. Leto overrules her, but tells her she will only have to eat in the dining hall on formal occasions.
Why does she have such longstanding negative feelings toward this person, that many years after his death she doesn't want to see his likeness and wishes to curse him?