Kids and patience

My daughter left for Church camp yesterday (for a week) and my son can't seem to stand her being gone.  He has cried all morning and wants a video game called "Call of Duty".  I really do not like games like this because you are shooting people on it.  I am trying to decide if I should get him the game or not.  He has already walked the dog and is continuing to complain.  What to do?