Heinrich Wendling with wife Carolyn appears on the 1920 census
Henry Wendling 39
Caroline O Wendling 41
Mathilda Wendling 19
Anna C Wendling 8
Gisella M Wendling 5
Henretta Wendling 3
Henry F Wendling 0
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Both Henry, Caroline and their first child Mathilda are listed as being born in Austria and emigrating in 1906 for Heinrich and 1907 for Caroline and Mathilda - this is documentary evidence if this is your family. Caroline and the children appear in the 1930 and 1940 censuses. Heinrich seems to die in Centralia, Washington Nov 11 1928 ( Washington death index
On his WWI draft card, Heinrich lists himself as Henry, his birthday as Dec 7 1880 in Austria, and his wife as Caroline
In the Ancestry Family Trees there are also several Public trees with this family all giving Austria as birthplace. One gives Caroline the surname Pozar
There is also a Johann Heinrich Wandling From Bukovia, Romania Who married a Christina Rumpel and had a son Josef Heinrich in 1902 - this familly also lived in Lewis, Washington
You should always check any facts on these trees for collaborating documents
I imagine one of these families is yours but from your post - I'm not sure which