Here is some information on Kirby's first wife, Ellen Radford. It seems they had a son born in NC as well:
Kirby Roscoe Brinson Jr.
Date of Birth: 25 Sep 1932
Birth County: Lenoir
Parent1 Name: Kirby R Brinson
Parent2 Name: Ellen Radford
Roll Number: B_C059_66001
Volume: 19
Page: 944
Edward Earl Brinson
Date of Birth: 28 Apr 1935
Birth County: Lenoir
Parent1 Name: Kirby Roscoe Brinson
Parent2 Name: Ellen Louise Radford
Roll Number: B_C059_66001
Volume: 22
Page: 991
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