I don't know if this is going to be of any help, but here goes!!!!
Ny Grandfather was Leonard Roylance (b 1908 or 1909, d1972). I know he had a brother killed in World War 1 (sorry, not sure of his name, will check this out the next time that I speak with my father.....we also have distant cousins in New Zealand, so maybe there is a link here).
Anyway, Leonard married Grace Ullyatt, (b1906 d 1998). They had 2 sons, Roger Frances Roylance (b1930 - ), and Clive (b1943 -) Roger married to Molly Green, they have twin sons; Huw (thats me!) and Keith, born 28th January 1961 (exactly 38years to the day before you posted this enquiry!!). I am still single, Keith is married to Stepanie.
Clive married Jill Snellgrove, and they have 2 daughters; Faye Eloise (b1973 -), and Fiona (b1974 -).
I will try and find out more information regarding Leonard's (I know he was known as Len) brothers / sisters for you.