Demons in the Garden (1982)

Juan is the handsome, irresponsible, best-loved second son. When his older brother, who runs the family's black-market business with their steel-willed mother, marries Juan's lover Ana, Juan heads for Madrid to work for Franco. Juan also leaves behind his impoverished cousin, Ángela, pregnant with his son. Jump ten years. Juanito, the lad, has rheumatic fever. The doctor says to pamper the boy. Ángela, Ana, and his grandmother comply. As Juanito recovers, his father returns in desperate need of cash; Juanito witnesses a theft blamed on his innocent mother. Things come to a head at a saint's-name party for father and son. Jealousies, betrayals, and a bullet converge.

Unfortunately the movie Demons in the Garden is not yet available on HBO Max.