The channel posted lived footage of its reporter Wael Al Dahdouh crying as he saw them laying lifeless.
The pan-Arab Al Jazeera TV said the family members of its correspondent in Gaza - his wife, daughter and son - were killed in an Israeli air strike on Gaza on Wednesday night.
There was no immediate comment from the Israeli military on the incident.
The channel posted lived footage of its reporter Wael Al Dahdouh crying as he saw them laying lifeless in hospital.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)