Grief is something that everybody copes with differently.
It is difficult for somebody to go through the experience of losing a loved one and not feel like they have been changed by it, especially when the loss happens while they are young. This is the kind of thing that is hard enough to process as an adult, let alone when you are still growing up and much more affected by any change in the family unit. Many people feel like it is an event that they will carry with them in some way for the rest of their lives.
An issue that can arise in families when somebody passes is that the ways in which everybody processes a loss can clash considerably. Some feel the need to move on as quickly as possible, while others want to keep their memory alive in any way they can. The result is a rift in the family unit that may never be truly healed.