@itsmehonestDon't know if it's similar, because I've not read the two stories you mentioned.
Old Man with a Pen's Surprise Melody Flintkote is the story of one of the Flintkote triplets.
John Walter (JW), Cynthia Mae, and I were born on April First, 1977. But not exactly...
Cyndimae was first. She was born on March 31st 1977 at precisely 11:45.
JW was born at exactly 12 midnight March 31st/April 1st and therefore was born on both days ... his birth certificate reflects this fact.
I was born April 1st at 12:45.
Twins were predicted.
Triplets were not. I was the Surprise!
According to family legend, Mom said ... quite surprised at me not being the expected afterbirth... "Surprise Me," And the Nurse who was recording the event for posterity wrote that on my birth certificate.
HM.