It looks like he married Margareta/Marguerita Seymour Pabst on 30 April 1894 in Victoria, Ca.
He was a traveller by profession and one son Arnold Willoughby Armstrong, born 13 June 1904 in York County, Ontario and possibly another Irving Wellington Armstrong born 19 April 1899 in San Fransisco. I W Armstrong's service record gives his mother as Marguerita Armstrong but that's the only connection I can find so far
Do you have him on the census in 1871 with his parents?
We can't post anything about living people on the forum though.