Would Cecil's parents count since they show up in the DS version? In IX the adorable younger Summoner's parents and grandfather are mentioned as dead for angst reasons and her Mog buddy dies then becomes a summoning. The the adorable black mage's grandfather's dead is a big part of his character. Vaan's brother's death was mostly for Vaan's angst. Though I'm not sure if any of those would count.

Anyway, very awesome idea!