My sister died. You may have the same or very few of the emotions your other family members are showing. The death of any child overwhelms that child's parents regardless of the cause of death or the age of the child. Parental grief is intense, long-lasting and complex. Many believe that this grief, desolation, and pain exceed all other bereavement experiences a person encounters in a lifetime.
Bereaved parents are completely bewildered and find it very difficult just to function.
Someday, you will recognize that you are making progress in your journey through grief. A child has died. There are no words to make that right. There are some things you can do to be supportive. There are on magic words.