Preliminarily, the appellant argues that the Chancellor misconceived the test to be applied in cases such as the present one when she stated that the appellant had made no “strong showing” that the appellee was unfit to have the custody of the children. However, we think the Chancellor made it abundantly clear, both in her remarks throughout the case, and at the close of the hearings, that the determinative factor upon which she intended to, and did, decide the issue of custody was the best interests of the children. Hence we find no merit in this contention.
This Court has stated many times that the paramount consideration in determining to whom the custody of a child should be awarded is the best interests and welfare of the child. Winter v. Crowley, Jr., 231 Md. 323, 190 A. 2d 87 (1963) ; Mason v. Mason, 228 Md. 387, 179 A. 2d 897 (1962) ; Bray v. Bray, 225 Md. 476, 171 A. 2d 500 (1961); Hild v. Hild, 221 Md. 349, 157 A. 2d 442 (1960). Ordinarily, unless the mother is an unfit person, when other things are equal preference is given to her in awarding the custody of young children as she is considered the natural custodian of the young. Parker v. Parker, 222 Md. 69, 158 A. 2d 607 (1960); Hild v. Hild, supra; Roussey v. Roussey, 210 Md. 261, 123 A. 2d 354 (1956). However where a divorce is granted on the ground of the mother’s adultery, the custody of the children is ordinarily awarded to the father, if he is a fit and proper person. Parker v. Parker, supra; Hild v. Hild, supra. The reason underlying this rule is not to punish the mother or reward the father, but rather is based upon the assumption that when the mother has committed adultery this is a persuasive indication that she is not a proper person to have custody of her children, and a strong showing is necessary to overcome this presumption. Wood v. Wood, 227 Md. 112, 175 A. 2d 573 (1961); Parker v. Parker, supra; Hild v. Hild, supra. The fact that she has married her paramour is, alone, insufficient. Bray v. Bray, supra.
The facts in the case before us are similar in many respects to those in the recent case of Winter v. Crowley, Jr., supra, and we think that case controls the instant situation. In Winter, a custody case, the appellee-husband had been awarded a divorce a vinculo matrimonii from the appellant on the ground