Regarding Burn: I define "young" only as "not Elder". She's not listed among the forces the Errant could invoke or in any of the other mentionings, so I figure she's second-generation. (Or else totally unrelated to the Elder forces, but of a similar age -- which is possible, since some of them seem to come from elsewhere.)
Was the QoD L'oric's mom, or just an ally? Damn, these alliances are confusing.
I didn't read Olar Ethil as being insane with pride. Yeah, totally unreasonable and desperately out of touch with reality, but she is stated to be extremely dangerous multiple times by the other Elder gods. Or, rather, she used to be -- dying has diminished her. And if Olar Ethil is herself associated with motherhood, even if Tiam is not, the fact she's dead (and thus removed from the life cycle) means she's basically crippled herself. Which she acknowledges:
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'...that Ritual - you were cursing them! Look at you--'
'Yes! Look at me! Do I not choose to wear that curse? My own body, my own flesh! What more can I do-- . . . I have no choice in this-none! . . . I am trying to save your pathetic lives! All of you!' (DoD p.693)
(This was also the scene that convinced me that, while she's a raging bitch, it's very likely she was genuinely trying to do what she thought was right. Problem is, the Ritual removes feelings had in life, and so true remorse/mercy was a long time ago.)
Basically -- while Olar Ethil might once have been a true embodiment of some vast multi-faceted force of fecundity, she's demoted herself to exceptionally bitchy appendix. And as Torrent says, she's been split apart for so long the relation is now truth in name only. (So worrywort, I'm with you on that one.)
Here's another passage that I thought was kind of interesting in relation to the potential Tiam bloodline issue, even though it was presented as a throw-away line about the KCCM:
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In an unbroken line from each mother to every daughter, memory survived, perpetuating a continuous history of experience. . . . There was a goddess of the K'Chain Che'Malle. Immortal, omniscient as such things were supposed to be. The goddess was the Matron, mahybe of the eternal oil. Once, that oil had been of such strength and volume that hundreds of matrons were needed as holy vessels. (DoD p.461-462)
While the KCCM aren't literally "first born of dragons," meaning this has no actual bearing on what dragons may or may not do, their hereditary history, passed from mother to daughter, does seem to have resonance with whatever the hell happens among Tiam's daughters. I don't mean it's the same personality reincarnating again and again (Mach and Actyl were different, for example), and certainly they don't share consciousness or anything, but maybe memories/experiences remain. This would explain why Olar Ethil claims she "is" multiple beings while still being resolutely Imass/Eleint.
-- Totally cool with being wrong as long as it's fun getting there