Does the same thing apply with your siblings?
Assuming you mean if they know of my special interestes; No, very few people I know IRL have any knowledge of my interests, though I've never really tried to hide it, pretty much the only people that know about it are the ones whom I had a special interest conversation with. (speaking of course about my more intense special interestes)
Assuming you mean I'm attracted to them (back to incest); Definitely not, I mean I wish I did have an attractive young sister, but it is more that I get off to other peoples family relations, instead of my own.