Clifford Walker born about 1918 was the eldest son of Joseph Scott Walker and Harriet "Hattie" Rita (nee Frazier) Walker.
Clifford died between the 1920 and 1930 census. His age range at his passing would have been between 2 and 12.
He is recorded here:
https://www.familysearch.org/ark:/61903/1:1:M8HW-4FF
Clifford Walker
United States Census, 1920
Event Place: Joplin, Jasper, Missouri, United States
Gender: Male Age: 2
Marital Status: Single
Race: White
Relationship to Head of Household: Son
Birth Year (Estimated): 1918
Birthplace:.................. Missouri
Father's Birthplace:.... Missouri
Mother's Birthplace:... Missouri
Sheet Letter: A Sheet Number: 2
Household .............. Role...... Sex........ Age.. Birthplace
Joseph Walker Jr..... Head.... Male....... 26.... Missouri
Harriett R Walker .... Wife...... Female.. 23.... Missouri
Joseph Walker 3rd.. Son....... Male....... 0...... Missouri
Clifford Walker......... Son....... Male....... 2...... Missouri
==============
He is not recorded here:
https://www.familysearch.org/ark:/61903/1:1:XHFK-MJZ
Scott J Walker
United States Census, 1930
Event Place: Joplin, Jasper, Missouri, United States
Gender: Male Age: 36
Marital Status: Married
Race: White
Relationship to Head of Household: Head
Birth Year (Estimated): 1894
Birthplace:.................. Missouri
Father's Birthplace:.... Missouri
Mother's Birthplace:... Missouri
Sheet Letter: B Sheet Number: 3
Household .............. Role............ Sex...... Age.. Birthplace
Scott J Walker.......... Head......... Male...... 36.... Missouri
Harriett A Walker...... Wife......... Female... 33.... Missouri
Joe S Walker............. Son........... Male...... 11.... Missouri
Nellie J Walker......... Daughter.. Female... 7..... Missouri