our walk through this life
I'm sorry to hear of such a great tragedy such as this for you and your family.
These things make us all stop and think of the meaning of life, and remind us that we are only here for a relatively brief time, and the serious importance of our knowing why.
After the grief and anger fades, please inform us as to whether this murderer had a history of mental disorder, a criminal record, or had acted out violence before towards your cousin. I will presume that such is true, and that this murderer should not have had a firearm in his posession.
If you are able, watch out for the custody of the children, as they will be helpless, and vunerable to being placed in an enviornment that may be detrimental to them. That is probably the most realistic tribute of affection you could give to your cousin and aunt.
May God comfort you.