Obina Ezeoke, 24, of no fixed abode, is charged with murdering Annie Besala Ekofo, 53, and 21-year-old Bervil Kalikaka-Ekofo.
Officers attended and found two people - A mum-of-nine and her nephew - suffering gunshot injuries. Both were pronounced dead at the scene.
They have been named by family members as Anny Ekofo, 52, and her nephew Bevely, 21. Both were killed following a shooting at a flat in London.
The Metropolitan Police have launched a murder investigation after the pair were pronounced dead by emergency services at the flat in Elmshurst Crescent in East Finchley, shortly after 6.30am on Thursday.
Mrs Ekofo's cousin, Fifi Selo said: "We cannot explain what happened. We don't know if it was because of their colour. It's a shock."
She added that Mrs Ekofo and her husband Jean Pierre had been living in the UK for around 25 years after moving from Congo in central Africa.
Ms Selo, 38, said: "They were an amazing family. Anny was the kind of person who was a mum to everybody. She always brought everybody together.
"They were a nice couple and they had nine children. We don't know where they are."
Armed police were called to the address after reports of two people injured.
They found the two victims, confirmed as a man and a woman, with gunshot wounds. The pair were pronounced dead at the scene, detectives said.
A road which had been cordoned off has since been reopened.
A neighbour, who did not wish to be named, said: "The police woke us up this morning. There were about eight cars and three ambulances."
Members of Mr and Mrs Ekofo's family, including Mrs Ekofo's mother and sister from other parts of London, attended the scene.
Another distressed neighbour said: "They were a new family, they had only been here for about three months.
"As a mother I feel so sorry for the family. It's so hard to see another mother like this."
No arrests have been made and inquiries are continuing.
In February more than 200 residents on the council estate signed a petition to try and keep their resident caretaker after Barnet Homes, the organisation which manages Barnet Council’s 12,000 council homes, carried out a value-for-money review.
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