Just looked again and his fathers date of birth is listed as 1936, only the year, nothing more.
My father was born near the far north end of Vancouver Island in British Columbia, Canada in 1918. The only thing he knew for sure was the year he was born. His family picked a day to celebrate as his birthday which was April 18. He was the oldest child and his mother was not able to recall his birth.
It's possible things weren't as advanced as far as record keeping goes in 1936 Kenya as they were in 1918 Canada. Maybe that could help explain the year only birth for Oblahblah's father.