I heard about this thing a while ago, it's just a random family tome, that happened to contain a few people by certain names, it doesn't mean anything at all. I can tear it's arguments apart in seconds:
1. For the story they have made up about this tomb to be the truth Jesus would have to have lived out a normal life and died of old age.
2. It is documented by many non-christian sources that Jesus was executed by the romans.
3. For him then to have died of old age he would have had to have first risen from the dead.
4. If someone comes back to life after public execution, would they really then live out a normal life and die of old age?