Let them know who to go to for help if there is a family emergency. Maybe your child had a fight with the person who died. Maybe your child wished this person wasn't around to get so much attention from other family members. Reassure your children that saying and wishing things do not cause a death to happen. They see that people go away and come back.
Cartoon characters die and then jump up again.
Young children may need to be told several times that the person won't be back ever. Young children may think the dead body still has feelings and walks and talks under the ground. You may need to explain that the body doesn't work anymore. It can't breathe, walk, talk or eat anymore. Answer questions related to God and your faith according to your own beliefs.