Greetings...

Possibility but the years are off from what you stated:

-----

Mother is Vinn Lee Piper (not Ethyl), but son Paul Edward and daughter Juanita Piper.

-----------
1940 Census page:

https://familysearch.org/pal:/MM9.1.1/K7QQ-ZMZ

Name: Ralph D Piper
Event Year: 1940
Event Place: Louisburg, Grant Township, Dallas, Missouri, United States
Gender: Male
Age: 37
Marital Status: Married
Race (Standardized): White
Relationship to Head of Household (Standardized): Head
Birthplace: Missouri
Estimated Birth Year: 1903
Residence in 1935: Rural, Dallas, Missouri
Enumeration District Number: 30-1
Family Number: 119
Sheet Number and Letter: 6B
Line Number: 58
NARA Publication Number: T627
NARA Roll Number: 2101
Digital Folder Number: 005460036
Image Number: 00349

Household Gender Age Birthplace
Head Ralph D Piper M 37 Missouri
Wife Vinn Lee Piper F 39 Missouri
Son Paul Edward Piper M 12 Missouri
Daugh Jaunita Fay Piper F 10 Missouri
Daugh Myrtle May Piper F 8 Missouri
Daugh Georgia Piper F 5 Missouri
Daugh Evaline Piper F 3 Missouri

Citing this Record

"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K7QQ-ZMH : accessed 19 Mar 2013), Ralph D Piper, Louisburg, Grant Township, Dallas, Missouri, United States; citing enumeration district (ED) 30-1, sheet 6B, family 119, NARA digital publication T627, roll 2101.