Why do siblings think they can get away with so much?

why do people always think that they can get away with things? Espeacially little brothers and sisters? Will you tell me your stories similar to that?

Yeah. I have a friend who writes all over my stuff, pokes me, makes rude-ish jokes, all that stuff. But if I do it to her she FLIPS OUT at me. I hate it.

I also hate how a certain friend of mine borrows money off EVERYONE but just figures that since she's her, she doesn't have to pay people back. Like, NO. Being YOU doesn't mean you can do whatever you want.

welll yeah..I have this/these friend(s!) that always thinks she can do whatever she wants to me (like trip me up or pinch "as a joke" yeeeah shes soOo funny, NOT. and insult my hair and clothes and even my EYEBROWS!!!), but then when I say or do anything back to her (also as a funny "joke", she goes all crazy at me..
and whenever I do something different with my hair, she always touchs it but if I lay a finger on her hair she's all like "oh my god, goooOo away, how dare you"...
sorry if thats not what ya meant but that really pees me off how shes so hipacritical..!

oh and when my older brother and sister take the remote off me or hit me whenever I have the remote and try to change the channel!!!