Here’s a good way to imbue self-worth in a child: When the child completes his or her task, he or she should be thanked and the parents should compliment the child’s good work to others. This will raise the likelihood that the child will feel special. And if the child’s completed task were an exceptionally difficult one, it would be nice for one or both parents to praise the child in even more laudatory tones to others – and to do so with the celebrated child present. This will inevitably increase the child’s desire to offer more assistance in the future.
I wish you hatzlachah in dealing with this situation, and thank you again for addressing this extremely important issue.