I have no idea where the info about "the kid" being a Bhaalspawn came from. I can only find a single reference to "thekid" in the gamefiles and it's in the same faction file that calls Helia "denleader"
Sylvira seems more like a camp follower than an origin companion to me based on the few references there are for her.
Didn't really make sense for Gale as no "bandages" to speak of.
In the midst of putting together a video about the three tags but really cannot find a single thing referencing thekid's parentage of their supposed status as a Bhaalspawn. Anyone else? I imagine this is why the post on the codex claiming thekid's parentage has several "citation needed" things under it.