I've come late to this discussion, but even if your sister isn't interested, as others have said, I'd keep on with your research. I know some people have 'issues' with the memory of others, but personally I fail to understand this - what happened, happened, talking about it won't make it any worse, better or undo it.
Neither my husband nor our daughters are the slightest bit interested in my passion for family research, showing only polite interest, but since both my husband and I were only children and our parents are long since deceased, if I don't do it - no-one will. It is of course possible that when I fall off my perch someone will just bin everything I've done as being so much junk, or .. they may just decide to keep it for my grandchildren (if I ever get any!) - either way that'll be their choice.
In the meantime, I don't need feel I need anyone's permission or approval, it's something which gives me a great deal of pleasure and since it doesn't (well - usually) involve drinking, yelling and screaming, painting my face with daft flags or looking for rival fans to beat the living daylights out of, it's certainly less anti-social than other pastimes I could mention.
All I would say is that my research is just that - mine. I have the information on paper and on my computer and so, from a purely personal point of view, I can't imagine any circumstances under which I would need or want to put it on 'the net'; although having said that, I know some people are happy to do so - I guess it's just a matter of personal choice.
You keep at it - if others don't like it ... just don't bother to tell them.