personally you being selfish but i can see why you feel like this and to be honest it is understandable, you feel hurt and cheated on. however think about your half brother, he hasnt had a mom for an 'x' amount of years and he must be really happy he got little brothers and a mother. Accept your half-brother and realise the pain your mom must have went through by giving the child away, it must have been hard for her. i think your half-brother is a good guy for tracing your mom himself. Go for it be supportive to your parents, be the strong child and welcome your half-brother into your family!!