There is something to be acknowledge and that is JWS parents want to see their children progress in the congregations they attend. either if being first among the peers of the JWS children to get baptized. etc.
Its bragging rights more or less, look see how well my child is progressing in their spirituality next week he's giving a talk, and might pioneer next month and so forth..
Parents of children that don't go out in service, give talks or clean the Hall after meetings are looked upon as not very devoted and spiritually weak, making their parents look bad in appearance and acceptance.