"It was quite an extraordinary day for the family," Sir Bob said.
Being recognised in the New Year Honours list had been tinged with sadness because of his father's health, he said.
"As a son, to be able to give this to my dad at the end of his life - it's way beyond words to describe the sense of humility and the feeling of pride to tell him this has happened, and to see that it meant so much to him," he said before his father died.
Sir Bob said he never expected the honour, which he views as a tribute to those he worked alongside, particularly in the aftermath of the Canterbury earthquakes.
"It's a tribute to council staff who ran Civil Defence and the infrastructure work we did, it's for Usar [Urban Search and Rescue], defence forces, emergency services, volunteers and the whole community."
His 22 years in local government included two terms as Christchurch Mayor. Sir Bob's father is survived by his wife, Audrey.