I am the oldest (23) in my immediate family, I have a 7 year old brother and a 14 year old sister, before I moved out of my parents house I used to be like a second father to my siblings. I straight out told them what they were doing wrong and possible solutions to their mistakes, my 7 year old was the easiest to get through but my 14 year old sister was like I was talking to a brick wall, she acknowledged everything I told her and was a great listener of my advise but turned right around and did what I just told her was wrong to do..simple things none major like cutting down going out almost everyday and talking to the wrong people but as I mentioned continues to do so anyway, now you may ask "shouldn't this be the parents concern?" ..well thats the problem, she gets a "yes" from them every single time, I've sat down with my mother and told her that all this time she spends away from home at this age is really changing her before she got the key to all this freedom, she of course like the majority of teenagers and influence from her peers has grown to become very arrogant and severly cocky when she doesn't get her way or when I try to correct her somehow...my mother acknowledges and agrees that we shouldn't completely cut her freedom but only limit it and she tells me how much she worries when she goes out, which totally bums me out because she tells me these things and her worries and how she agrees with me but in the spur of the moment when my sister approaches my mom, she no longer asks...she says: "I'm going to ###'s house" in this very impatient posture and my mom..i don't know..sort becomes intimadated or her mind goes blank and she answers in this helpless voice "OK" every single time and the spoiled brat gets her way and runs off, is there some sort of advise I could give to either my mom or my hard headed sister that can snap them out of it...should I step in and physically hold my sister from going and confront my mom and at that time tell her to snap out of it? And The Father?..you may ask...he works nights and sleeps all day so he has no idea what is going on but let me tell you..he is worse than my mom..a big bold strong "yes" followed by a $20 dollar bill which i think is COMPLETELY! Wrong and spoiling to my sister, I want to fix this but how??
Well I think you are being a great older brother looking out for your sister that way, my sisters always looked out for me until I got old enough to do things that I wanted and knew were right. However, I think that you may be trying a little too much here. A teenager will be a teenager and do pretty much what they want to, one way or another. It is just a phase, I am sure you went through it, and I am sure the 7 year old will too. She will grow out of it or learn something the hard way (god forbid) to straighten her out. I say don't worry about it so much, you will all live through it.