Yes, it is a bit gratuitous, and at times a little irritating, but still just both comforting and fun.
Review based on 2017 re-read:
I had much the same reaction as during my first read, and I think I was able to pinpoint my irritation a bit more: I can't quite buy the way Cass and Kaoren, at such a young age, are such perfect parents. Granted that they're living in the best possible situation, with a built-in extended family, and that Kaoren in particular has the discipline of his training and the benefit of his Sights, but parenting usually involves at least some level of chaos and some mistakes are normal and expected. Yet young as they are, they don't put a step wrong, especially given that they're dealing with traumatised children. At the same time, what salvages this is what has sustained the whole series, and that's Cass's sensible, funny, self-deprecating narrative voice. It was lots of fun and a feel-good read despite my reservations.