Sub:Aditya is your borther.
I can understand your feelings.All of a sudden an unknown person entering your lives and your mother saying that he is your brother , its hard to digest.so you take your own time and if you have anger on your mother for what ever she did,then shout at her .yell at her and stop talking to her.But dont doubt her character.Afterall she is your mother. dont make false assumptiosn her..if you do so also she will forgive you because she is your mother.if not she who will forgive,but after understanding her situation you will regret and you will get ashamed of yourself.
Thankyou
Arpitha.