On Sunday, April 22, McIlwaine took advantage of the warm weather to wax his car out front, with his two sons, Tyler, 4, and Conner, 6, playing nearby.
"First hot day of spring and they're itching to get outside after a long Canadian winter and first thing they want to do is have a water fight," he told The Early Edition's Rick Cluff.
Tyler got his pants wet and McIlwaine told him to go put on some shorts. Instead, he emerged from the house completely naked.
"It was all what seemed to be harmless innocence. I felt like at four years old, he's still pure, he's still innocent," said McIlwaine.
Mcllwaine said he didn't hear anything from neighbours at the time. A few days later, he was in Kelowna, B.C. on business and his wife, Margita, called him in tears.
The police had come to the house for a visit that he said lasted more than half an hour, telling her that there could be "further action" if it happens again.
Mcllwaine returned early from his trip and went to the detachment the next day. He was told they had to respond to the call because it involved a child.
"The disturbing part of it was ... I had [previously had] a break-in in the middle of the day, with my wife and children inside the house eating lunch, and the RCMP had never even bothered to come — they said that they didn't have resources," he said.
McIlwaine said his older son is now afraid of the police — fearing he and his brother could be taken from their parents.
The Squamish RCMP declined an interview, but provided a written statement from Staff Sgt. Brian Cumming.
"I have spoken to Mrs. and Mr. McIlwaine, explained that we responded to a complaint from another citizen about their son being out on the street with no clothes on a few days earlier," it reads.
"They did not feel this was handled well by the officers responding despite my explanations, and I offered an apology for the fact that they were not happy and felt their son was now afraid of the police."
To hear the full interview with Ian McIlwaine, listen to the audio labelled: Naked 4-year-old prompts police visit.