There are special reference works known as genealogical or, more often, biographical dictionaries. These tend to focus primarily on the immediate family connections (parents, spouses, children and their spouses) of the article subject. Wikipedia is an encyclopedia, and as such focuses more on the actions and contributions of an article subject. This means that many genealogical details may be omitted, for a better-flowing, more rounded article.
Biography articles should only be created for people with some sort of [[Wikipedia:Verifiability|verifiable]] notability. A good measure of [[Wikipedia:Notability|notability]] is whether someone has been featured in multiple, independent, [[Wikipedia:Reliable sources|reliable sources]]. However, minor figures may be mentioned within other articles (for example, Ronald Gay in [[
Violence against LGBT people]]).
''See also [[Wikipedia:Notability (people)]]. ''