« Reply #5 on: Tuesday 13 March 18 10:30 GMT (UK) »
I have an interesting example of this in my family. Two full brothers whose biological father (Mr M) had died. One brother was brought up by his maternal grandmother and her second husband, Mr E (he was unofficially given the step grandfather's surname). The other brother was brought up by the biological mother and her second husband Mr A (he took the step father's name). The boys attended school and grew up with different surnames. In 1914 they enlisted both using their "acquired" names. Later the older one was told he could "claim" his younger brother so they might serve together. Of course that was when the name difference came to light. It was decided they could only serve together if they used their correct surname so they both reverted to that name from that point onwards. I was told that it was only on their wedding day that my grandmother was informed that she would be Mrs M and not Mrs E. I am not sure that part could be true - what about the banns? Certainly though throughout their courtship my grandfather was E and not M. This does not answer the original question and I too would be interested to know if there was a requirement to produce official documentation. I guess there would be a great many who did not have such a thing. So far I too have not been able to find my grandfather's records under either of his names.
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