Final answer:
Prophet Ya'qoub reacted to the false news of his son's death with profound distress and weeping, which led to the loss of his sight, even as he expressed patience and reliance on God.
Step-by-step explanation:
The reaction of Prophet Ya'qoub (Jacob) to his beloved son's false death is not narrated with these particular details in the reference texts provided. However, according to Islamic tradition as found in the Quran and Hadith, when Prophet Ya'qoub was given the false news of his son Yusuf's (Joseph's) death, he became profoundly distressed and wept until he lost his sight.
Even in his sorrow, Ya'qoub's reaction was one of patience and faith as he responded by saying, "So patience is most fitting. And it is Allah (alone) whose help can be sought against that which you assert," indicating his reliance on God during this trial.