The father of all of them was Julyan Caudill as can be seen in the 1900 Census listing Julyan (Line 71) as July By mistake: He is a Male, born on May 1870, Widower; his wife probably died at the time of Grabril's birth on January of the same year.
There was also living with Julyan's family his daughter Margaret Young (Line 76, Born on Dec. 1861).
The family listed just above Julyan's family is his brother Moses's family (Lines 63 to 70), Moses was born on July 1856.
Isam Caudill and Juda were the parents of Moses, Margaret and Julyan as can be seen in this 1870 Census record:
Event Type: Census
Event Year: 1870
Event Place: Kentucky, United States
Page Number: 6
Household ID: 33
Line Number: 1
Affiliate Name: The U.S. National Archives and Records Administration (NARA)
Affiliate Publication Number: M593
GS Film number: 000545993
Digital Folder Number: 004269354
Image Number: 00537
Household Role Sex Age Birthplace
Isam Caudill M 43 Kentucky
Juda Caudill F 46 North Carolina
Henry Caudill M 18 Kentucky
Nancy Caudill F 16 Kentucky
Moses Caudill M 14 Kentucky
Lucinda Caudill F 12 Kentucky
Margret Caudill F 7 Kentucky
Salley Caudill F 5 Kentucky
Patsey Caudill F 3 Kentucky
Julyan Caudill F 1 Kentucky
William Caudill M 0 Kentucky
Citing this Record:
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXW1-PZG : 12 April 2016), Isam Caudill, Kentucky, United States; citing p. 6, family 33, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,993.
I hope this information helps in your search.