>> I never heard any "brother wolf and sister squid" bilge <<
I'm guessing the reference, which was actually "brother wolf, sister loon" is a sarcastic takeoff of "Brother son, Sister moon." A lot of wierdos, mistaking the meaning of that, (or purposely disregarding it) have tried to work that into all sorts of pagan dreck. Poor St. Francis; if only the people who supposedly love him would read more than a bumper stickers' worth of his writing!
I believe it was merely St. Francis' way of describing his chaste relationship with St. Claire.
... in fact, I don't even know if it was merely a later literary invention...