[@OwO] Copy pasting relevant bits, and adding a bit of my thoughts re how this could tie in with Estelle.

As for the mother: I was thinking of this prodigal warrior who was born as a commoner, and made her name after enlisting in the military. She'd then become a knight to the Kaides, one of those elite Glavios ppl. Prolly did sth silly like keep challenging the patriarch of the family, and either bc she won one spar one time or bc the dude got charmed otherwise, became one of his wives (or the one mistress he has besides the 3 wives). As a character she'd generally be affable, feisty, believing that effort and self-determination can overcome any obstacle. But she'd also be not that well adapted to the noble society - obv if she was the wife or mistress, she prolly did go through some basics, but ya know. Not stupid, but lacking guile, and not really getting/brushing off how some others in the family (or outside) might have resented her. This could be tied into either or both of the assassination attempts if either you or Rune want it to. The mother is basically a once in a 1000 years talent who doesn't think she was born special, but became like that cause she worked her ass off. I can see Estelle thriving with that kind of parenting, meanwhile the middle and youngest sister felt quite pressured. 

Was also gonna have my character ditch the family at 21 (though she'd still visit her youngest sister here and there), but probably she and Estelle never did manage to meet up until maybe the Kaidysum's last stand.

Also, looking at Estelle's height, I guess it's good I imagined the mother as this 2-meter or so giantess, beefy muscled, can swing a claymore one handed kinda gal, ha. Don't think I'll have my character be any higher than 180cm [i]at most[/i], though.

[@Silver Carrot] Oh, wonderful, a time line! Love that.