My grandfather had his attorney draw up a new will the attorney brought the new will to him to sign but he passed away that day is the will valid
I am assuming the new will was never executed, and that your grandfather died before it could be signed. If that is the case, then no, the new will is not valid.
If he never signed the new will, then it is not valid.
The will he never signed is not valid. The previous will, if validly executed, needs to be probated.
Sorry for your loss. No the will is not valid but the attorney could have told you that. If there was some substantial reason for the change of the will, then you may have to file a contested action with his old will in order to obtain whatever the new will would have allowed.