Sharing genes with other people has indeed been a source of headaches since the beginning of time (take, for example, the whole Garden of Eden fiasco). Luckily,

Sharing genes with other people has indeed been a source of headaches since the beginning of time (take, for example, the whole Garden of Eden fiasco). Luckily, the advantages of being inside the genetic group, like say inheritance, usually outweigh the nuisance.