Maz through adoption agencey or social services could you speak to someone there,who could act as go between and speak to both you and your brother seperately
They could offer you professional help in dealing with whatever the outcome,and as it whether he would like to meet ut.
Maz your story is heartbreaking,take great comfort that she knew of you and wanted to know you.
Good luck Maz i hope you get a happy ending
you deserve it.
b