Quote from the article:
The first five family members to fall ill had identical strains of A(H5N1), one found in animals in Indonesia. But that virus had mutated slightly in the sixth victim, a child, and he apparently passed the mutated virus to his father, who cared for him in a hospital without proper protection, said Dr. Tim Uyeki, an American epidemiologist on the W.H.O. team.
However before you panic, the dad only got it after prolonged contact with the son, none of the relatives and neighbours have been infected so far. So the risk of transmission through casual contact is still very low.
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