If my biological Grandfather happened to be Howard Hughes, would anything happen?

He paraded around with lots of ladies, so, its possible he fathered a child or two. You need to take a DNA test but you also need his DNA to test against. You would first need gigantic proof you are related to allow them to exhume the body because they would say no. He was reportedly married three times. The last in 1949 without divorce. But much of his wealth was eventually divided up between 22 cousins. Maybe one of them will give up DNA to prove you are related. The mechanics and inheritance dealing out of an intestate will has been satisfied by the courts. Although you'd not get money with proof you'd get bragging rights.