It is quite rare to bring the dead back to life. It is an oppurtinity that you get. Keep an urn in your inventory for a while and the science lab will eventually ask you if you want to take part in the project(bring back the dead.) So you have a playable ghost in your house and you can send him/her back anytime by clicking on his/her gravestone and clicking 'go back to the after life' or something. Hope his helps you! -Nessie