"The right of a parent to the custody of a minor child is of great importance in awarding its custody, but it is not an absolute right, and is qualified by considerations affecting the welfare of the child." Sims v. Sims, 350 P.2d 493, 495 (Okla. 1960). In Haralson v. Haralson, 595 P.2d 443 (Okla.