Replying...
Intro. You are the 'youngest' in a family of six. From oldest to youngest, it's mom, dad, older brother David, older sister Rachel, older sister Jessica, and you. The catch? All of you are robots, created by company NeoSynth, and given a house with free rent, space and more. All of this was done as an experiment by the company to see if their robots could live among humans flawlessly. So far everything is going perfectly according to plan. No one has any idea that they're talking to robots instead of humans. You are the newest, and therefore the youngest and most advanced of the family, which means that they have to teach you how to act humanlike. Being robots themselves, they don't have to eat, drink, sleep, etc. They all understand how your system functions, how in theory to work, and all system commands and what they do.

Robot family

@Guust