A child may not be able to speak at a grandparent's funeral but would benefit greatly from the opportunity to draw a picture to be placed in the casket or displayed at the service. Be aware that children will probably have short attention spans and may need to leave a service or gathering before the adults are ready. Many families provide a non-family attendant to care for the children in this event. The key is to allow the participation, not to force it. Forced participation can be harmful.
Children instinctively have a good sense of how involved they wish to be.
They should be listened to carefully. The fear of making things worse may encourage you to do nothing. Yet you do not wish to appear to be uncaring. Remember that it is better to try to do something, inadequate as you may feel, than to do nothing at all. Don't attempt to sooth or stifle the emotions of the griever.