How do certain siblings end up significantly better looking than others?

The purpose of this subreddit is to discuss beauty, its implications, such as the social issues that people with beauty or the lack thereof experience, etc. Also, to discuss objective beauty and other issues related to the subreddits /r/truerateme and /r/trueratecelebrities. Also, no posts of offensive people, such as murderers, rapists, etc. What constitutes on offensive person is at the sole discretion of the mods