How public familiar ties are once again varies a lot, though given how infamous Nightsong/Emnity is and such, rumours about Fellwing's relation to her might be floating about. Also, I imagine if Skobeloff really wanted to find anything out about his clutchmates, it wouldn't be too difficult for him considering his House and trickster nature. Whether he would feel comfortable digging into his clutchmates personal lives is up to Rush, of course.