I tried under the names Vest, MacArthur and Brady
What would help is your Fathers birth date and death date
Where your Father was born
When your Father was adopted
Where your Grand Mother lived
So all I could find is the following. I am not sure if any of this info applies.
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Found a Find-a-grave entry for William Glen Brady:
https://www.findagrave.com/memorial/26109621
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Found on Ancestry.com:
Genevieve Vest in the U.S., Social Security Applications and Claims Index, 1936-2007
Name: Genevieve Vest
[Genevieve McArthur]
Gender: Female
Race: White
Birth Date: 25 May 1915
Birth Place: Talking Rock, Georgia
Death Date: Apr 1988
Father: David U McArthur
Mother: Georgie Nichloson
SSN: 414179949
Type of Claim: Birth record established before age of 5.
Notes: 09 Aug 1974: Name listed as GENEVIEVE VEST
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