I don't have Morgan in my tree, however I did a bit of searching and found some info. In the 1930 US Census of Fond du Lac, WI, he appears living in the household of Albert F Trasher, whom his mother has married; he is listed as "stepson".
Household:
Albert B Trasher 52
Winnie M Trasher 52
Maud I Trasher 19
Mable E Trasher 15
Wade H Trasher 13
William M Silsby 8 stepson


In the 1940 US Census of Washington, OR, he is single and head of the following household:
1940 Washington, OR
Morgan Selsby 18
Archie Elliott 20
James W Eldridge 41


I was able to find what I assume are his parents and brothers in the 1920 US Census of Fond du Lac, WI.
Household:
Joe Silsby 53
Winins Silsby 42
Lloyed Silsby 14
Lester Silsby 12


In the 1921 Fond du Lac City Directory I found:
Silsby, Joseph (Winnie), candymaker Bonita Co, h 429 Russell


I hope this helps. Frank