The following article from Much Loved explains a lot about grieving and dealing with the death of a loved one.
This article details on what it means to be grieving, how grieving is sometimes more than just how you feel and think. Grieving is a very different process for everyone. Sometimes grieving causes withdrawal while other times it cause people to want to have others around.
Much loved also discusses the key principles to remember when dealing with the death of a loved one. It also discusses how you can help a grieving friend of child deal with the death of a loved one.