I have been examining the church records of Bohorodczany and:
Joannes Stempurski (no Michel indicated) was 23 when he married the 16-year old Marianna Sobolewska in 1852,
Joannes's parents were Nicolai and Anna Semianowicz (Semianow).
Marianna Stempurska (from the house of Sobolewski) died in Bohorodczany 14 December 1907 at 71 years of age of "marasmus senilis" and was buried two days later.
I have not found a Constanty Stempurski in the Bohorodczany records, though there are a number of "Stempurski" there.
So something is not right in your records.
Let's sort this out.