Adelaide Belcourt Glenn was my great aunt. My grandmother was Marie Julie Belcourt Robinson who was her youngest surviving sister.
The Archivist for the Oblate Fathers at the Archives located by St. Joachim's Cathedral was ver ykingd and helpful. he showed me records hand written in French of many of our ancestors' births.
It is quite possible they would also have marriage record. I do not know if copies could be obtained.
Good luck and God's blessings to you!! Ken