I sometimes say racist things to my biracial son.
Why would you be racist to your biracial son?
He is not my blood.
It is terrible that you would be racist to your own son. You need to treat your family with love and respect always.
WTF he is family because I'm his parent.  I make the decisions.
You are right, to a certain extent, but remember that no matter how you treat him, your son will grow up with you as a role model.  You shouldn't be teaching your son to carry on with these racist attitudes.  Try to set a better example.