The blaze broke out at the property on Renfrew Road, Paisley, around 9pm on Friday.
Fiona Gibson, 12; Alexander James Gibson, eight; and five-year-old Philip Gibson were taken to the Queen Elizabeth University Hospital in Glasgow, but sadly died a short time after being admitted.
A 39-year-old woman is also in a critical condition at Paisley’s Royal Alexandra Hospital.
The smell of smoke still surrounded the scene at the Gallohill housing estate on Saturday as people left tributes by the police cordon.
One woman passerby said local people were left “shocked” by what happened and simply added: “God bless those weans.”
Among the flowers left at the scene were some from Gavin Newlands, MP for Paisley and Renfrewshire North, who wrote on a card: “We are all so sorry for your heartbreaking loss.
“Our thoughts and prayers are with you all.”
