Voodoo dolls found in casket....?

Today, my grandfather's remains were dug up 50 years after his death. The reason was to place his remains with that of his wife, my grandmother. In his casket was found 10 bottles with what appeared to be voodoo dolls and papers in each. The only legible word on the papers were our family's last name. We think the ten bottles may represent his 9 kids and wife. What does this mean, how could this happen, why would someone do this? Is it witchcraft, a spell, or curse? Does anyone have any clue?