While researching this topic, we found an ethnography by Dr. David Graeber about different experiences Malagasy people have that starts Famadihana:
“In September of 1990 I was talking with a woman named Irina about something an ancestor of hers had done some 60 years earlier. Like all the andriana or nobles of Betafo (a community to the north of the town of Arivonimamo, in Imerina, Madagascar) she was descended from a certain Andrianambololona, whose body, together with those of his wife and daughter and of three of his retainers, was buried in a large white tomb in the center of the village of Betafo, a five-minute walk across the rice fields from her house.
This particular ancestor, she was telling me, has long had the custom of appearing to his descendants in dreams to announce when the occupants of the tomb felt cold and needed to have a famadihana performed: that is, to be taken out and wrapped in new silk shrouds. When this happened in 1931, his descendants quickly gathered and organized the ritual. But, in their hurry perhaps, they forgot to exhume the bodies of the three retainers buried at the foot of the tomb somewhat apart from the rest. “The afternoon after they’d finished,” she said, “the town suddenly caught fire and burned to the ground. And the next morning he came once more to the person”-the individual who had originally had the dream-“and said, ‘If you don’t wrap us all, next time I’ll kill you outright .. .’ So they got the tombs ready again and rewrapped
them.'”