Chris and Ruth Stone-Houghton died in September 2022 at their home in Portsmouth.
An inquest found there had been a “failure to fully support” the family after Chris was discharged from a psychiatric hospital weeks earlier.
Their son Oliver said “we don’t need to forgive him. I never once questioned that it was anything other than his illness”.
The Hampshire and Isle of Wight Healthcare NHS Foundation Trust said it had “learnt from this case” to improve care for patients in a mental health crisis and their families.
Chris and Ruth were loving and caring parents, Oliver and Abbie Stone-Houghton said, and devoted to one another.
“We had such a brilliant childhood, and even in their adult life we were so close with both of them,” explained Abbie.
Chris ran a jewellery business which Ruth had also worked in. He had no previous mental health issues but as the company struggled during the Covid pandemic, eventually closing in April 2022, he began to experience delusional thoughts.
He became increasingly paranoid, wrongly believing he was being listened to by his phone and computer, and terrified someone was out to get him. He became withdrawn, looked noticeably frailer and experienced suicidal thoughts.
“He didn’t feel like he had anything to offer anymore,” his son Oliver, now 30, remembered.
