Kim Harris, who played cricket at a decent level himself, was just happy to see his son playing in a Test match and was not going to quibble just yet about him not making the start count, recalling the emotional ride his family has been on.
"Well it has been going on for the last two days. First there was the baggy green presentation on Thursday. And that is very big in Australian cricket and everybody dreams of that. The boys in Australia all dream of that," said Kim.
"So to be be there and see my son do that was special. It took a few takes to actually go ‘where are we? We are standing on the Adelaide Oval and 456 is his Test number and no-one can take that from him."
The two chat a lot about cricket, but Kim knows where to draw the line.
"We are a father-son team as such so we always talk about cricket. Not that I was a left-hander, I was a right-hander.
"I played cricket at a fairly high level. So we do know what’s right and what’s wrong," said Kim.
"I have wrecked a shoulder throwing buckets and buckets of balls at him. I know what his strengths and weaknesses are and he has got better and better over the years."
While some sporting fathers tend to want too much of their sons, Kim likes to keep it light.
"If someone said to me ‘what would you take for Marcus?’, and I would say we would love to get him off the mark and one on the pads, which Jasprit Bumrah did and I am very excited about that.
"He has been under the radar of Australia cricket for a long time," said Kim.
"He knows how to pick his time and which ball to hit. He has shown that in the Big Bash. This is another level for him and I think he can handle that. I honestly believe that he can do it."
Family ties are strong in the Harris family and Marcus was especially close to his grandmother.
"She lived with us when Marcus was little fellow. Every Saturday morning she would tell Marcus that he would get 20 dollars for a hundred and on days that would happen my mother would hand him the money.
"When he was 15, in a particular season he hit 11 hundreds. My mother told him: ‘Marcus you are going to bankrupt me.’ Even when he became a first-class player for Western Australia and would make a hundred, she would put in $20 in a card and write ‘to my favourite grandson’, and put it on his bed.
"Marcus would tell her that she didn’t need to put the $20 in the card now as he was earning his pay from cricket but she would say that ‘you got to keep it as that’s the deal’. Mum passed away three years ago but yes they were very close.”
Would it be fair to say then that Marcus is living Kim’s dream?
“You could say that. Every dad would love that. But it’s his road. I am just glad that I am sitting the back passages and knowing we are with him. I will support him all the way.”