A father is taking legal action against police for nervous shock and psychiatric injury after officers fatally shot his son in their backyard.

Adam Balzan awoke to the sounds of bangs and crashes as plain-clothes police chased his 20-year-old son into their western Sydney home and shot him dead in 2020.

A coroner on Thursday found the police officers' decisions to detain, pursue and use force against Bradley Balzan were unjustified and unreasonable.

While the report has offered some answers, it could not address the myriad impacts that have flowed from his death, prompting the father to take NSW Police to court.

"I can only begin to imagine how grief struck they are," his lawyer Peter O'Brien said on Friday.

"This young man was a beautiful young boy who had extensive love for his fami

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