Mills v. State, 193 Ga. 139, 147 (1) ( 17 S.E.2d 719); Matthews v. Grace, 199 Ga. 400, 404 (2) ( 34 S.E.2d 454). If the alleged newly discovered evidence could have been obtained by the exercise of ordinary diligence, the denial of a new trial is proper. Arnall v. State, 14 Ga. App. 472 ( 81 S.E. 366); Stevens v. Calder, 190 Ga. 745 ( 10 S.E.2d 751). The Supreme Court has held that "a new trial will not be granted on the ground of newly discovered testimony, where such testimony is that of the movant's sons, and could have been known and used on the trial if diligence had been used." Wilkinson v. Smith, 57 Ga. 609 (2). Among reasons given for affirming a denial of a new trial, this court held that "The `newly discovered' witness is a brother of the accused, lives with him, and was present at the trial of this case.