I'm taking on board all of the different POV's, thank you.
Fortunately it was very easy for me to trace my sibling once I knew which local authority he was born under.
I googled the telephone number of the adoption sector in the L.A, left a message explaining who i was and who i was looking for, then within days I had a call back from a lovely lady who knew him personally and had been working with him.
As it happens, they had been trying to contact my mother unsuccessfully in the years leading up to me finding out about him and vice versa.
He wrote her letters which were sent to my mother via the adoption agency and there were phonecalls made in attempt to speak to her too. The adoption agency worked hard on his behalf to get a message across to her that he was looking. She knew.
She asked her sisters advice as to what she thought she should do and her sister insisted the past was the past and should be left there. Said sister returned one of the calls and spoke on my mother's behalf to a social worker, with my mothers permission, and said she didn't want contact.
Now, that is entirely her prerogative and nobody has the right to demand she has a relationship with him but what she failed to consider was us and the fact that we both, if given the information, would have (and do) want a relationship with one another.
There were many times she could have told me about him, like when she knew he was trying to find her, I would have respected her wishes to have no contact herself and wouldn't have put any pressure on her to meet him (and I never have)
Alternatively when she knew he was trying to contact her she could have told the social worker acting as an intermediary that she didn't want contact but she has a daughter who might etc.
It feels like we are supposed to have endless compassion for her despite her having none for us, she has done alot damage in her time - not just to me but also my brother in how she handled his attempts to find her, depriving him of even the most basic of information about his identity.
I'm just glad we have one another.