Parents say that the children are brought by grandparents. How do you refute that?

Parents said that the children were brought up by grandparents, and retorted that although the old man is old, he may not know how to raise children scientifically. Just because you can take care of children and feed them doesn't mean you can educate them. Curiosity about new things is the first step in learning. It is inevitable to encounter bumps in the process of exploration. You can't tie your hands for fear of injury. You can't let go. After all, most flowers in the greenhouse can't stand the wind and rain. Education is a science, and adults should help children learn to understand society, instead of drawing various boundaries for them from the beginning. Instead of children's cognition of society, in fact, this deprives children of the opportunity and right to seek knowledge themselves.