Here are some more 'exact' dates for the deaths
STOCK, WILHELMINE
Date of Birth: na
Place of Birth: na
Mother Maiden Name: na
certid# 1920-MN-014829
Date of Death: 12 Feb 1920
County of Death: SIBLEY
=====================
STOCK, FERDNAND
Date of Birth: na
Place of Birth: na
Mother Maiden Name: na
certid# 1927-MN-013840
Date of Death: 24 Feb 1927
County of Death: SIBLEY
=======================
STOCK, FERDINAND CARL HENRY
Date of Birth: 21 Jul 1889
Place of Birth: MINNESOTA
Mother Maiden Name: AHRENS
certid# 1965-MN-031527
Date of Death: 20 Dec 1965
County of Death: SIBLEY
This is from the Sibley County grave database:
1.) This most likely will be Wilhelmine
Name: STOCK,
DOB: 22 Jan 1860
DOD: 12-Feb-20
Location: Saint Paul's Evangelical Lutheran Cemetery (Arlington) note 1
2.) This most likely will be Ferdinand
Name: STOCK,
DOB: 11 Sep 1853
DOD: 24-Feb-27
Location: Saint Paul's Evangelical Lutheran Cemetery (Arlington) note 1
This should do as a start. If you are interested in the obits, let me know. I spend a lot of time in the Arlington Enterprise newspaper.