David Thomson (left) with his late father Ken, who was the patriarch of Canada's richest family.

The Thomson and Weston families have seen double-digit growth in their net worth since last year, according to an annual ranking of Canada's wealthiest people.

Canadian Business magazine estimates the Thomson family's net worth has grown to 26.1 billion, up 30 per cent from $20.1 billion last year.

The Thomson family has long topped annual lists of Canada's most wealthy people.

Among its major holdings is Thomson Reuters, a public company that delivers professional information to several industries, and the private Woodbridge Co., majority owner of the Globe and Mail.

No. 2 on the list with a net worth of $10.4 billion is Galen Weston, whose son Galen Jr., heads the Loblaw grocery business. The Weston fortune is up 24 per cent from last year's estimate of $8.2 billion.

The Irving family, which owns Atlantic Canada's largest chain of gasoline stations, a major oil refinery, shipbuilding yard and other businesses, continues at No. 3 with an estimated worth of $7.85 billion, down three per cent from $8.07 billion.