You have a little sibling. Especially a sister. The kid is wronged somehow. What do you do? Do you deal with the offender in a calm, civil manner? Or failing that, perhaps you are a little upset, yet you keep control over your emotions, and keep yourself as restrained as you can? Or do you congratulate the offender, the offender's friends, anyone connected to the offender for keeping your little sibling or son in line? If you are the latter, then congratulations! You are a Spartan Family Member. Unlike the Knight Templar Big Brother or Parent, the Spartan Family Member has absolutely no regard for their young one's well being. For example, say the Spartan Sibling brother got hurt in a fight. Rather than tending to their wounds, they will be given a simple roll of bandages to patch himself up and let him heal himself or rub salt in their wounds by giving them verbal abuse stating how it wouldn't have happened if they were stronger. If anyone has mistreated their children, they will be glad to side with the other side over their child/sibling as they feel "The kid deserved what they got" and the only remedy they offer to their child is "Toughen up, the world's a harsh place". The Spartan Family Member is also prevalent in stories where only one can survive or uphold the family honour. This creates a dog eat dog style environment between almost every member of the family and anything that can get rid of their sibling's stake in the pot is perfectly acceptable. They often see all forms of competition as a litmus test of survival (ranging from fighting to just cleaning the house), so if you are perceived to be the weakest link, your parents will treat you as an unwanted child and your siblings will mock your inferiority. Doing well will earn praise from your parents and scorn from your siblings. This naturally builds up resentment and a begrudging respect by all sides. Any punishment by them know that it is wrong and harmful but do it anyway because it gives them a harsh lesson in life, a fact that you are raising your kid or sibling The Spartan Way and that they need to be hardened against your idea of a cold hard world and that they don't need to like it or them. Just need prove they will not crumble under such pressures under any circumstances. It is not to say however they will glad to see their family die in a horrible way. To them, their children didn't die because they are weak but because sometimes in life, there are just some things one cannot overcome by being the best in the family.
Examples:Anime and Manga