When William Daniel Robertson was born on February 26, 1869, in Erin, Ontario, Canada, his father, Archibald, was 27 and his mother, Janet, was 25.
He married Barbara Darroch on December 25, 1894, in Canada. They had six children in 14 years.
He died on May 23, 1959, in Saskatoon, Saskatchewan, Canada, at the age of 90, and was buried in Rosetown, Saskatchewan, Canada.