Aamir, a student hoping to study law at Cardiff University, had answered the door to face what the prosecution called a "cowardly and brutal attack" by two "heroin-fuelled killers".
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Mr Kidwai was one of a number of Aamir's friends who organised a football match in honour of the sport-mad teenager in the period after his death.
Family friend Sher Ali, president of the Cardiff branch of the UK Islamic Mission, had known Aamir since he was a boy.
On that day, Aamir was expecting to have a lesson from the imam.
She and her husband, who had stayed over the previous night, had not long left to pick up a takeaway for Aamir.
The store is a mile away from Aamir's home and the two men had called in around midday on Sunday - just over an hour before Aamir was killed.
It was, said Mr Harrington, a colossal and fatal mistake for Aamir, who was hoping to study law at Cardiff University.
BBC: Aamir Siddiqi Cardiff murder jury resumes deliberations
The jury in the Aamir Siddiqi murder trial has been told that a third person must have been involved in the killing.
The prosecution called it a colossal, fatal mistake for Aamir.
Aamir ran downstairs offering to open the door - a decision which devastated the family and cost the youngster his life.
The court was told how a passer-by heard screaming and saw Aamir's parents crying out for help.
BBC: Aamir Siddiqi: Defendant seen on CCTV 'spending proceeds'
He described Aamir as someone with "great aspirations and great ambition" who had a fantastic memory.
Aamir Siddiqi innocently answered his door expecting to see his local imam for a Koran lesson.
Alice Patten appeared with Aamir Khan in the award-winning film Rang De Basanti, playing a young woman who goes to India to make a documentary film about the British rule in the Indian subcontinent.
When the doorbell rang on a normal April Sunday afternoon, 17-year-old schoolboy Aamir Siddiqi volunteered to answer.
The court has heard that just before he died, Aamir had been upstairs in his bedroom awaiting the arrival of an imam for a Koran lesson.
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The court has heard that just before he died, promising student Aamir had been upstairs in his bedroom awaiting the arrival of an imam for a Koran lesson.
The court has heard how both parents were slashed as they put up a fierce and frantic fight to try to stop the men repeatedly stabbing Aamir.
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Aamir's head teacher at his school, the private Cardiff Academy for GCSE and A-level students, remembers a lovely pupil who was very academically gifted.
There was a happy and relaxed atmosphere in the household on that sunny Sunday in the house and Aamir's father was singing when his mother noticed someone at the door.
Left-arm seamer Aamir (1-23) coaxed Redmond into mistiming an attempted heave over mid-on, gifting a catch to Gul, before Razzaq had Guptill trapped leg-before with a full, in-swinging delivery.
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