You know those heart-warming stories you read of families being reunited? And sometimes -- often, really -- the particular relatives don't know each other exists? Yeah, that happened to me. Through the miracle of DNA science, my two sisters and I found out we have a half-sister in the state my father was born in and spent part of his twenties. And just last week, my sisters and I traveled to Minnesota to meet Nancy, our half sister, discovered through Ancestry.It was my cousin Joanie who first alerted us to the possibilities of having a new relative. On Ancestry, Nancy came up as her first cousin. On my sister Denise's profile, Nancy's DNA and age could make her only one thing -- a half ...