Sub-castle posts and Ya. Tape

There is a problem: I read LJ through Ya. Tape (well, through rss). I’m reading not the whole friend tape, but most of it. The problem is obvious: sub-castle posts do not come to me there. They are not many, not everyone has them, but I almost missed quite important things. Attention, the question: how to make sure that the sub-posts of those whom I read (of those who freind me, i.e. posts are available to me) are sucked into Ya. Tape?