Legal procedure to disown

You can't disown son and how can you do that, by saying this you're blaming your wife for conceiving this son from someone else. You can disinherit your son if you so desire by making Will of your property or wealth in favor of someone else after your death or giving away it as gift to someone during your lifetime. Another way is by making declaration or publication about disinheriting your son of all your property and wealth.