By Natalie Alcoba ( February 19, 2015, 7:00 PM EST) -- For four years, Cris Lam and her younger brother, Billy, worked at Toronto’s Benmor Family Law Group. They would commute to the midtown office together, and frequently have “family lunch” in a boardroom with another lawyer whose brother was the head of marketing at the same small firm. Beyond that, though, the Lams were conscious about creating a buffer between them at the office, working on different floors and handling different files....