The 28-year-old allegedly entered his sister's bedroom and repeatedly stabbed her with a knife, as reported by itv News.
Caroline allegedly entered the room after hearing her daughter scream, but the suspect lunged at her with the knife before running away from the house on Auriel Avenue.
While Aina's mom was confirmed dead at the scene, his sister was taken to the hospital and later released after being treated for her stab wounds.
Samantha Southey, a neighbour who resided next door to the victims' house, allegedly said that she heard the ruckus after the tragedy.
'I just heard some commotion last night,' she added. When I answered, the police said they had apprehended the suspect and had knocked on the door. To some extent, it's terrifying.
On Tuesday, November 1, Aina was reportedly brought before Judge Philip Katz KC at Barkingside Magistrates' Court on charges of first-degree murder and attempted murder.
Due in the Old Bailey Court on Thursday, he was remanded to police custody.
Superintendent Richard Vandenbergh, a detective with the East Area Command Unit, called the event "really stunning."
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