The 1930 Census shows that your father Vernon and his brother Rolland were approximately one and two. The census also shows that "Lucille" (born in Iowa) was married prior to her marriage to Charles Overturf.
Backing up to the 1920 Census, it shows Lucille living with her step-father and mother, Henry and Dollie Laspe.
Moving forward, the 1930 census Henry and Dollie Laspe have a granddaughter Murriel Pieniening (Pienieng) age 6, living with them (whose mother was born in Iowa). I believe Murriel is the living sister you are seeking. Now the question is...how do you find her?
Not related.
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