Stephen Wilson didn't flinch when he was called on to help deliver his own grandson after his daughter-in-law went into premature labour.
And he even used a pair of shoelaces from his son's new trainers to tie the umbilical cord before cutting it.
The surreal and heartwarming drama unfolded at Vikki's home in Scunthorpe, Lincs.
Describing the experience to her local newspaper, Vikki, 28, said: "I woke up in the morning with a bit of tummy ache and felt a bit groggy but thought nothing of it as I had been experiencing that throughout my pregnancy.
"My husband Simon had gone to work in Hull so I was on my own.
"Just after 11am I had a shooting pain in my tummy and thought it could be a contraction.
"I rang Simon and said 'I think I am having the baby, you need to come home now'.
"He said he would and called my father-in-law, who lives about 10 minutes away to come and wait with me."
Vikki, who has four other children, said she then went upstairs to get dressed and had another contraction within two minutes.
I thought 'that was quick', but I managed to put on a pair of Scunthorpe United shorts and a T-shirt.
"I then went down to the kitchen and I felt a big burst of pain and my waters broke. "I was very scared and could feel the baby coming.
"Thankfully, my father-in-law arrived and told me to sit down as the baby was coming now."
Stephen followed step-by-step guidance from the ambulance service by phone. "He told me I needed to do one more big push," said Vikki.
Then baby Isaac 'shot out' and started crying.
The phone medic told Stephen he needed to tie the cord to stop the blood supply before cutting it.
My husband had some new trainers nearby so Steve used the laces to tie the cord before he cut it.
"I was so glad he was there," said Vicki.
Grandad Stephen, 61, said: "When I arrived at the house all I could hear was screaming so I ran into the house to find Vikki on the floor.
I have never delivered a baby before but there was no time to think. Natural instinct was all I had.
Vikki and Isaac were taken to Scunthorpe General Hospital. Isaac weighed 8lbs 10oz and was taken into intensive care because he was cold and had low blood sugar levels, but he was safely at home a few days later.
Talk about a baby bonding a family!