The 41-year-old admitted manslaughter by diminished duty after psychiatrists concluded he was struggling a delusional dysfunction.
On the Previous Bailey on Thursday, Mrs Justice Cutts handed him a hospital order with out restrict of time.
She informed him: “The results of your actions have been devastating.
“Two younger and harmless youngsters have had their futures and their lives taken from them by their very own father.
“Your spouse got here out of the bathe on what she thought of to be a traditional day to essentially the most horrific scene possible.
“Her infants useless or dying on the mattress, you with a knife in your hand.”
In a sufferer affect assertion, the youngsters’s mom, Nisanthini Nithiyakumar, stated: “After my youngsters have been born I used to be the happiest lady on this planet. Each second I spent with my youngsters, these have been my happiest moments.
“They have been each my world and I doted on them, my future ambitions and my life surrounded my youngsters.”
She stated Nigish had a stunning smile and character and Pavinya was a “blessing and miracle”.
Of their killings, she stated: “I by no means anticipated this type of incident to occur in my life and a mom to survive her youngsters.
“On the day of the incident I noticed my youngsters and what he did to them. I couldn’t perceive if it was dream or a nightmare, with these surprising pictures by no means leaving me.”
The courtroom heard the defendant had been granted asylum after arriving in Britain from Sri Lanka in 1999.
He first got here to the eye of psychological well being providers in 2010 and was placed on anti-psychotic remedy however his therapy lapsed.
On Sunday April 26, he returned to the household dwelling in Ilford simply after 4.30pm.
Over the subsequent hour, he washed and watched tv earlier than slitting his youngsters’s throats and chopping his personal neck and chest whereas his spouse was within the bathe.
When Mrs Nithiyakumar heard noises and went to see what was occurring, he informed her: “I’ve reduce the youngsters off.”
He claimed there was a “downside” at work and the police have been in search of him, the courtroom heard.
He informed his spouse: “In the event that they get the youngsters they may spoil them. That’s the reason I did this to the youngsters.”
By the point police arrived, Mrs Nithiyakumar was screaming and hysterical.
She informed officers: “He stabbed himself and he stabbed the children as nicely.”
Pavinya was pronounced useless on the scene and Nigish died later in hospital.
The defendant underwent surgical procedure and was positioned in an induced coma however survived.
Following his discharge from hospital, he informed police he was depressed and harassed, the courtroom heard.
He claimed clients on the store the place he labored had upset him and he had resolved to kill himself and the youngsters.
The courtroom heard there was no proof of issues at work.
In mitigation, Steven Perian QC stated: “The defendant realises what he has executed. He has began to grasp his actions and is devastated from what has occurred.”
Detective Chief Inspector Vicky Tunstall stated: “This has been a very tragic case. Regardless of the conclusion that the defendant was mentally unwell on the time of the deaths, the loss felt by the youngsters’s households will probably be endless and our ideas are with them at this unhappy time.”
Devi Kharran, senior Crown prosecutor for the CPS, stated: “This was a tragic case during which a loving and devoted mom had her two youngsters cruelly taken away from her.
“The CPS accepted the views of three medical specialists that he was clearly pushed to this by a severe medical dysfunction.
“All through this case the prosecution and the police have supported the youngsters’s mom by what have been very traumatic and troublesome courtroom proceedings. Our ideas stay together with her at the moment.”