As first reported in the Toronto Star:

Antons Kapostins is living in the Ajax home he helped build on 13 acres of farmland 50 years ago.
But it isn’t the 89-year-old’s home any more.
The Ministry of Transportation says it has owned the roughly half acre the house sits on since March 2011. That’s when the ministry expropriated a piece of the property to make room for the first phase of Highway 407 East construction.

But apparently, this is about more than expropriation and a dispute over the valuation of Mr. Kapostins’ home:

Kapostins said he recently told the ministry he wouldn’t “go without a fight” and some time after, police arrived at his home. They seized registered firearms belonging to his two sons, who are living with him, Kapostins said.
The ministry referred questions about the firearms to police. Durham Regional Police Service spokesman Dave Selby confirmed officers were made aware of a “potential public safety concern” by provincial officials and executed a public safety warrant. He said “numerous guns and ammunition” were seized on Sept. 27, all of which was legally owned and stored, and will be returned.
While Kapostins remains on Lake Ridge Rd., he said he doesn’t like being treated like a “criminal.”