User blog comment:SomeoneYouUsedToKnow/SYUTK'S V4E4 - Le Family - Impressions/Recap/@comment-26397825-20161121012203

You're looking into your ancestry. You are the descendant, your ancestors are where you get your nationality from, and researching it is referred to as researchig your ancestry. Since you were wondering if descency was a word. (As a side note, Decency is is word but it means behaviour that conforms to accepted standards of morality or respectability. Ie, common decency.)