How do I deal with a child who lies frequently and is 9 years old so that he does not get accustomed to it, and what should I do for a daughter who hits her siblings and is 11 years old so that she loves them with sincere love?

The upbringing of children and the rectification of their behaviors is a lengthy topic. This can be achieved by seeking help from Allah Almighty and supplicating for their righteousness at times when prayers are answered, by showering them with love, tenderness, and mercy, by spending sufficient time with them and participating in their activities, by minimizing their punishment and criticism, by keeping them away from negative external influences such as television and video, and by reading specialized books on child-rearing.