Mr Robinson said: “The argument was over fireworks from a while back, we have been told. We don’t know if one threw a firework at the other or what, but it was childish stuff… Where he was killed is just across the road from his gran. The family are devastated — his mother hasn’t even seen his body yet.”
He said that his nephew “had good morals and is well educated. His father is a pilot.”
The killing in Holland Walk at about 5.30pm on Monday came five days after Anas Mezenner, 17, was fatally stabbed in Turnpike Lane.
Police said that although the first lockdown was partly behind a fall in violence last year, curbs had had a negative effect on mental health among children and were potentially behind a rise in youngsters being killed in their own homes in domestic abuse cases.