Honor Thy Family

 Honor Thy Family is the quest you get when you disrespect the Dark Brotherhood

Overview
 * Prerequisite: None
 * Quest Giver: None
 * Reward: Re-admittance to the Dark Brotherhood
 * Reputation Gain: None

Ways to Get Kicked Out of the Dark Brotherhood
There are three(four) known ways to get kicked out of the Dark Brotherhood:
 * Feeding (Vampirism) on a Dark Brotherhood member (while not in stealth)
 * Killing a Dark Brotherhood Member
 * Note that the Spectral Assassin counts as a member.
 * Stealing from a Dark Brotherhood member
 * Having a Follower complete your contract kill seems to initiate this sequence of events as well (confirmation needed)

How to Get Re-admittance to the Dark Brotherhood
After getting kicked out of the Dark Brotherhood, you will not be able to do any contracts until you talk to Nazir. If you have a Dark Brotherhood Initiative as a companion, they will refuse to talk to you and will stop following you until you are re-admitted.

Talk to Nazir and he will tell you to pay 500 gold, less if you have high speech skills and/or perks. Paying Nazir will complete the quest and you will be re-admitted to the Brotherhood.