I am trying in vain to find Frederick Trimmer.   His parents are  James Herbert Trimmer born 5th Jan 1890 in Badshot Farnham and died in 1958 .He married Eva Coles on 4th Sep 1915 at the Parish of Hale Surrey.. Their witness's were : Fred Coles and Florence Horne.
James herbert Trimmer and Eva Coles had two children to my knowledge 
1. Arthur William  Trimmer b. 11th March 1920 in Surrey and died 29th Dec 1992
2, John Trimmer  born  6th Jan  1928 in Surrey and died 2nd June 2011 in Hamilton NZ.
They say there is a third child being Frederick Trimmer and  he died  during WW2. I have search records for his birth and can not find him anywhere. My thoughts were perhaps he was born out of wedlock and has another surname  since I can not find him. I am beging  to think he does not exist.  I am about to pull my hair out with frustration can anyone find this Frederick  to solve this mystery  

Many thanks
Maggie May.