The ISIS militant who appears in a video purporting to show a boy executing an captive Israeli-Arab is a French terrorist whose relatives include a notorious Islamist who slaughtered Jewish children and a woman who took her baby to join the violent extremists . Sabri Essid has been identified as a well-known jihadist , and the half-brother of Mohammed Merah , who shot dead three children , a rabbi and three paratroopers during a terror rampage in the French city of Toulouse . But the two , who are understood to have been close before Merah 's 30-hour stand-off with French special forces ended in his death , are among a number of extremists radicalised within the same family . Merah 's sister Souad is known to have travelled to Iraq and Syria to join Islamic State with her four children - including her nine-month-old baby . Family : The man on the right of ISIS 's latest horrific video has been identified as Sabri Essid , a French terrorist who is a member of a family with a number of radicalised extremists . Essid , a married father , was named by security experts earlier today , after he appeared alongside the young boy in a video claiming to show the execution of a so-called Arab Israeli spy . The man believed to be Essid stands by the boy speaks in French as he refers to the attack on a kosher supermarket in Paris in January in which four Jews were killed . 'Oh Jews , indeed Allah has gifted us with killing your followers in your own stronghold in France , ' says the man . However , doubt has been cast on the authenticity of the video , which is heavily edited . Experts have questioned whether the boy , thought to be about ten , was really the person who pulled the trigger , supposedly murdering 19-year-old Muhammad Said Ismail Musallam with a single gunshot . There is less mystery surrounding Essid himself , who has long been known to counter-terrorism forces . 'The similarities between Essid and the man in the video are very clear , ' said an investigating source in Paris . 'Plenty of experts have made the link . ' Terrorist : Mohammed Merah , Essid 's half-brother , killed seven people - including three children - in 2013 . Shooting : The 23-year-old targeted the Ozar Hatorah Jewish school in Toulouse , also killing a rabbi . A French police source has also told AFP , France 's national news agency , that 'we are checking ' the identity of the man in the video . Essid , 30 , from Toulouse , was caught in Syria in December 2006 in a house known to shelter Al-Qaeda members on their way to Iraq . He was sent back to France and was sentenced in 2009 to five years in jail , including one year suspended , in a case involving an Iraqi jihadist network . On his release in 2010 , he returned to Toulouse - where he became a constant companion of half-brother Merah . His father had lived with Merah 's mother , and Essid was close to the killer and his brother Abdelkader . Merah , 23 , would go on to wreak terror in the town , shooting three soldiers , a rabbi and three school children outside a Jewish school , before being shot dead . Radicalised : Mohammed 's sister Souad Merah , pictured , took her four children to join ISIS last year . Horror : The family of Muhammad Musalam , 19 , purportedly shot in the ISIS video by the unnamed child , have said the Arab-Israeli was not a spy . Pictured : Parents Said and Hind Musalam mourn in the family home . Essid left France for Syria in 2014 , as did Souad Merah , the sister of the Toulouse gunman , who took her children on the bus south from Toulouse to Barcelona , where they boarded Turkish Airlines flights to first Istanbul and then Gaziantep . Her husband Abdelouahed El Baghdadi , was arrested by French authorities , in September last year when he arrived back at Toulouse airport with the two older children . Their mother Souad Merah is believed to be in Algeria with the two youngest children . But it is not clear if Essid 's wife and children travelled with him to Syria .
Sabri Essid , a French citizen , has been identified as man in the lSIS video . Essid , a married father , thought to have joined Islamic State last year . The 30-year-old has served time in France for terror-related offences . Essid part of a family of extremists , including ISIS terrorist . Half-brother Mohammed Merah killed a rabbi and three children in 2013 . Shot dead by French special forces after 30 hour siege in apartment . Merah 's sister Souad travelled to Syria last year with her four children .