Provide moral support: Children generally depend on their parents most. They rely on their parents in many aspects. They need their parents the most especially when they face some unmanageable difficulties or problems. In that case, parent's moral support works as healing mantras to them. Many failed students can again do better results by having moral support from their parents.
Another problem with almost all worksheets is that they don't prevent incorrect answers. Self_checking worksheets just let the student know they did something wrong__after the fact. I am a firm believer in the concept that, if at all possible, learning should be structured in small chunks in such a way that there is very little possibility for error. Worksheets often allow for mistakes to be made and then to be repeated many times. A mistake that gets practiced is extremely difficult to correct. This especially happens when worksheets are used as time fillers or baby sitters and the work isn't really being supervised.