SWOT- I think legally, since he was adopted, you have to include him in the will. He could just to be nasty to his siblings, contest the will and he has the money to take it to court.
It could be like someone suggested above "Name, is left nothing per our desire and the fact that he has chosen to be in no contact for x number of years". By mentioning him, you have stated your intentions and it can't be misinterpreted in court that you accidentally left him out. This is why its so important to name him and also because he was adopted. Rules are different for step-children.
I am with you- children are not automatically entitled to any inheritance just because they are your children. Many parents leave entire inheritance to charities, foundations and totally nothing to their children. I think Microsoft guy is doing this.
Inheritance from your parents, family members is a gift, a choice.
I am on your side- that he has chosen to not have a relationship with you - he chose not to care about your well being when you were in an accident. It speaks volumes. As some have said, he could of course change. But, for me, I guess the damage has been done, on his terms, his wife's terms. Should he desire contact again and he makes amends and honestly attempts to heal the relationship with you- then you have the option of amending your will. But at this point, I don't feel he deserves any monetary inheritance.
