If it isn't too much, could you explain how the ancestors' stories related to their classpects? Some are obvious like )(IC "stealing" life, but the others I'm unsure about.

They don’t all exactly match up but here’s a rough go

Handmaid-Witch of Time: She did a lot of time travel and messing with the timeline
Summoner-Rogue of Breath: Taking Breath as being direction, he gave direction to others by leading a rebellion.
Psiionic-Heir of Doom: Taking an Heir as someone who becomes their aspect, he became a beacon of suffering as he was forced to a life of painful servitude. 
Signless-Seer of Blood: He saw glimpses of the Beforan society and attempted to give the same unity to Alternia
Disciple-Mage of Heart: I’m not too sure on this one so taking Mage as someone who guides by setting an example using knowledge pertaining to their aspect and Heart being Soul, she helped guide peoples beliefs for how they view themself and others?
Dolorosa-Maid of Space: Space being Birth and Creation, she took on the role of being the caretaker for a revolutionary
Redglare-Knight of Mind: Knight being one who exploits their aspect and Mind being Decisions and the Consequences of those decision, she was a lawyer, I think that’s pretty straight forward.
Mindfang-Sylph of Light: Honestly, I dunno man. The Light aspect is their since she could look into the all knowing cueball, but I don’t know how she fits Sylph, a healing class.
Darkleer-Page of Void: He has the void shadowing making him undetectable to First Guardians and the like, which Mindfang %ploits following the Serket tradition of being a dick to Pages and also the Page definition of providing others with their aspect.
Grand Highblood-Prince of Rage: He gets angry and kills people i.e. destruction via rage.
Dualscar-Bard of Hope: Dude, I have no idea. He didn’t really allow destruction of Hope or invite destruction through Hope so your guess is as good as mine
Condesce-Thief of Life: Obviously she’s killed a lot of people. Also she’s very old