Sigh.....logic here.
Parent's have a responsibility to care for and raise their children. They have a right to decide how to raise and care for their children so long as their children are taken care of to the best of the parent's ability (Food, shelter, health care, kept safe from harm, etc.).
Parent's don't have a right to control how other parents choose to raise their children. They can advise or suggest or even try to influence, but they should not have a blanket ability to make decisions, requirements, or prohibitions in regards to other families.
If they believe that a child is in danger, then they can report it to the local authorities who would then investigate the concern.
Government agencies can pass laws to protect children from harm, but the issue becomes what defines harm to a child? That is where it can get murky. Some types of harm are clear and well accepted such as abuse, neglect, abandonment.
When it comes to education or health care, then the question can be contentious. It shouldn't be, since logic has it that the rule of 'Best Possible' should apply to both. Best Possible Health Care and Best Possible Education based on a universally accepted modern standard designed to keep children physically and mentally healthy and well educated enough o have a chance to survive, thrive and be successful as adults. However, , as stated above,, Parents still retain the right to decide how their children should be educated, where their children should be educated, and by whom their children should be educated. Same with health care, so long as the children meet the standards of health and not neglect.