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Hello from JustAnswer.
The rate of progression of vitiligo can be very unpredictable, so it is possible that it could take years to become completely white. It is possible that it could be something other than vitiligo, but of the common conditions that cause white patches, the vitiligo is common to occur in familial clusters.
If I can provide any clarification, please let me know.
There are many cases of vitiligo that occur randomly, but between 1/3 and 1/2 occur in people with close family members that are also affected, which we refer to as familial clusters, because there is a cluster of cases within a family.
I understand that, and I am not saying that he definitely does, but this may be a manifestation of vitiligo. While the loss of pigment in skin will result in a white patch, the loss of pigment in hair will appear as grey hairs. There are other possible causes of grey hair in adolescents, but it is possible that both of you are having manifestations in different parts of the body.