Standing on the edge of the stream for a better view, the 8-year-old boy tripped and fell in, disappearing within seconds.
The third brother, 35, who was pulled from the water fully conscious, was examined on the spot and did not need medical treatment.
According to Ynet, this is the fifth case of a drowning death in Israel this week and the twenty-sixth since the beginning of May.
Rivera's son was found alone and sleeping in a drifting boat on Wednesday and told authorities they had both gone swimming but his mother never returned.
Jewish and Bedouin mourners joined together Sunday at the Ashkelon funeral of 45-year-old Micheal Ben-Zikri.
45-year-old Micheal Ben-Zickry from Ashdod was found unconscious, and the MDA team declared his death at the scene.
The man, who nearly drowned on Friday in the Sea of Galilee, tested positive for coronavirus soon after and was moved in critical condition to the coronavirus care unit in the hospital.
The man was the fifth weather-related casualty in the past week of heavy storms in Israel.
Authorities around the world are now explicitly warning people against using their smartphones whenever a child is near water.