Canon 226, §2--Because they have given life to their children, parents have a most serious obligation and enjoy the right to educate them; therefore Christian parents are especially to care for the Christian education of their children according to the teaching handed on by the Church.
Canon 774, §2--Parents above others are obliged to form their children in the faith and practice of the Christian life by word and example; godparents and those who take the place of parents are bound by an equivalent obligation.
Canon 793--§1. Parents as well as those who take their place are obliged and enjoy the right to educate their offspring; Catholic parents also have the duty and the right to select those means [books] and institutions [environment] through which they can provide more suitably for the Catholic education of the children according to local circumstances.
Canon 843, §1--The sacred ministers can not refuse the sacraments to those who ask for them at appropriate times, are properly disposed and are not prohibited by law [i.e. excommunicated persons] from receiving them.
Canon 890--The faithful are obliged to receive this sacrament at the appropriate time; their parents and shepherds of souls, especially pastors, are to see to it that the faithful are properly instructed to receive it and approach the sacrament at the appropriate time.