They can be accomplished to a degree, but a different model needs to be developed for parents who have lost a child. At this point it will be helpful to ask the group to discuss the 4 tasks. Invite them to discuss ways that parents could move toward adjustment. Grieving people are the best textbooks. Grief and the Family System Losing causes the whole family to wobble.
Every family system contains many sub-systems, little alliances or tightly knit circles.
Changes take place in both of these. The empty place left by the person who is gone necessitates a shuffling and a long process of reorganization. When the family adjusts to the loss, the configurations in the family system are not the same. Ask the group to share how their family system and sub-systems have changed. In the process of family adjustment there is always role reorganization.