"I married a hunter,'' Mrs Macdonald said.
"I was told not to get married in the duck shooting season.''
Although she did not share her husband's interest, both of her sons followed in their father's footsteps and began to share similar hobbies.
"Kerry put a firearm in their hands from a very young age,'' she told the court.
"I don't like guns personally, and I wasn't very happy about it.''
But they were boys and needed to learn about the safety of guns, she said.
Macdonald's father owns the Palmerston North Hunting and Fishing store which provided Macdonald cheap and easy access to hunting gear, including guns, when he was an adult.
Kerry Macdonald told the court of the arrangement he had with his sons that meant they could get gear from the shop at cost, rather than the marked-up price.
He told the jury he often arranged for the men to use guns from the shop for hunting trips but said Macdonald did not have access to any of his personal guns or work guns without him knowing.
Macdonald did not know the code to his personal gunsafe and those working at his shop had to tell him if a gun had been borrowed, he told defence lawyer Greg King.
The court has previously been told that Macdonald owned one shotgun, a gift from his father.
The court heard again today from Macdonald's wife Anna Macdonald, who is Mr Guy's sister, who said that after the birth of their third child she told Macdonald he could not go on any more big hunting trips. He never went on another long trip.
The court also heard more evidence about dive boots, a vital piece of evidence because of the distinctive ripple prints left at the crime scene.
Macdonald once owned a pair of such boots and the Crown alleges he was wearing them when he killed Mr Guy.
Marlene Macdonald said the last time she saw a dive boot was when she was looking for the Macdonalds' spare key - kept in one of the boots - in 2008.
The month before the murder she stayed at the Macdonalds' house to babysit her grandchildren and remembered looking for the spare key but the dive boot was not there.
"I am positive, I would swear on the Bible it was not there.''
Mr Macdonald said the boots - which could be bought at his shop - were used as camp boots, to slip on at the end of a day's hunting.
He said Macdonald used the boots in the evenings of their hunting trips.
Anna Macdonald also told the court of her efforts to recall the last time she saw such a boot.
The last time she remembered seeing the boot the key was kept in was at their old home, which they left in April 2008.
"I think I remember throwing [the boot] out, but I couldn't be 100 per cent sure.''
She previously told the jury she threw it onto a rubbish trailer before moving to the new home, but today admitted she could not be sure of that.
More evidence on the dive boots is expected to be heard early next week.
The boots worn at the crime scene have never been found.
Both Detective Sergeant Graham Perks and Detective Gregory Hogan, who were involved in searching the Macdonald property and 300ha farm, gave evidence today that they did not find anything of significance on the property after Macdonald's arrest.
The trial before Justice Simon France and a jury of 11 enters its fourth week on Monday.
