I am a relatively new and passionate researcher of my family tree, and have been working on my Irish lines, with surprising success. I have now encountered a problem - I was given anecdotal info of my great-great maternal grandparents family (BOYLAN of Clontarf, Dublin) by my own grandmother, which I was mostly able to evidence with BMD records, and the 1911 census.
However, having found well documented birth records of her sisters (Annie Boylan b. 1906, Margaret "madge" Christina Boylan b. 1908, Mary Catherine Boylan b. 1909 and Eileen Boylan b. 1910), I cannot find any record of my grandmother's birth - who I knew to be Jean Boylan b. 1928. This name is used on her marriage cert.
As you can see, she was born 18 years after her youngest sister, and though not impossible, this info, plus talk in my family of a secret, I am wondering whether Jean Boylan was not born into this family, and was maybe adopted.
Herein lies my problem. I am at a total loss where to go next - how to investigate a possible adoption/orphan in 1928 (before compulsory adoption records) with only the name "Jean" and a full D.O.B.
Does anyone have any advice at all on tracing a birth record with such little info, or what I can do next? I would like to be able to give my grandmother the answers to questions she has always wanted to ask, but never did.
Thank you!