Yes, I think you are safe to visit your relative in hospital. You are considered to be immune to the chickenpox virus now because you had the virus as a child. As you are immune you would not be able to pass it on to a third person. It is generally considered that you can only catch chickenpox once, although there is some evidence to suggest that it may be possible to catch chickenpox a second time (but it is very unusual). So if you are sure that you had chickenpox as a child, you should not worry about getting it again and passing it on.
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