To be fair, though, it's a little bit different because she's underaged. (At least, I think she is - she's always struck me as being somewhere around 15-17.) Also, it's different because Cass is otherwise essentially homeless - she showed up out of nowhere during 'No Man's Land', and ever since then, she's basically been hanging around with whichever member of the extended Bat-family would give her a place to sleep. Furthermore, the girl is HURTING for a father figure - her actual dad is Cain, who gave her precious little in the way of parental love or guidance. So her being adopted by Bruce was actually quite a meaningful gesture in my opinion, even if it's been pretty much ignored recently. (What does she think of recent events, anyway? Has she even MET Damien?)