aku päiviö and his finnish-born spouse ida hänninen had six children, four sons and two daughters. their eldest son jules päiviö was an architect and professor. he was the last surviving member of the mackenzie–papineau battalion fighting in the spanish civil war. as jules volunteered the war, aku wrote his most famous poem, "to my son in spain", dedicated to his son. päiviö's son, allan paivio, was an emeritus professor of psychology at the university of western ontario. he was best known for his dual-coding theory. his other sons were veikko paivio and raikas paivio, and daughters terttu (paivio) hart and tilhi (paivio) simmons, all deceased.