He is married to Francisca Develter.
They got married on September 29, 1897 at Zedelgem, West Flanders, Belgium, he was 40 years old.Source 2
FamilySearch: Belgium, West Flanders, Civil Registration, 1582-1910
Edouard Mahieu in entry for Léon Joseph Mahieu, "Belgium, West Flanders, Civil Registration, 1582-1910"
Lead confidence: 2
https://www.familysearch.org/ark:/61903/1:1:27J4-884
FamilySearch: Family Tree
Edouard Mahieu
Birth 19 April 1857 • Zedelgem, West Flanders, Belgium
Spouse Francisca Develter
Lead confidence: 5
https://www.familysearch.org/tree/person/GWX8-5MY
From FamilySearch.org
https://familysearch.org/ark:/61903/3:1:33S7-9P85-578?i=830&cc=2139860&cat=279163
https://familysearch.org/ark:/61903/4:1:GWX8-5MY