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Parents won't always be there to correct their kids but this doesn't disprove the fact that they have a major role to play in building the character of their kids. The problem we have most times is influence, some kids are raised correctly but along the line they become negatively influenced by their peers. Parents should not be the only ones to play this role, awareness on gambling addiction should be taught in schools
As parents, we fully understand that we can't supervise them all day, as we're also busy working, and we can't leave that work; we work for them (the children). A child should understand this. However, a child will never understand this unless they receive a good education from their parents from an early age. Therefore, I agree with what you said that building a child's character is very important. And I believe the benchmark of a parent's success in educating their children is when the child continues to behave well even outside of parental supervision.
Continuing with the world of education or schools, educational institutions are places where parents entrust their children to receive the education they need. However, it's very unfortunate, considering the education system in my country, the quality of educational institutions and teaching staff is currently considered quite poor, so it still falls far short of what parents expect from their children.