38. Custody of children.- In any proceeding under Chapter V or Chapter VI the district court may, from time to time, pass such interim orders and make such provisions in the decree as it may seem to it to be just and proper with respect to the custody, maintenance and education of minor children, consistently with their wishes wherever possible, and may, after the decree, upon application by petition for the purpose, make, revoke, suspend or vary, from time to time, all such orders and provisions with respect to the custody, maintenance and education of such children as might have been made by such decree or interim orders in case the proceeding for obtaining such decree were still pending.