i was out last night, things were goign well,

targets big bro came over, i didnt back down and just kept calm but i didnt want to deamog him 2 much since it was her family.

any1 have any advice on this situation, or tips on getting past big bros

Can you estimate their ages? How old is she and how much older than her is the older brother?

As a big brother myself, I might be able to offer a little bit of insight. I think you were right to be cautious about using too many anti-AMOG tactics against him. It might work, but if it doesn't, you haven't just failed to shut down the AMOG; you've alienated his baby sister.

Depending on the nature of their relationship, you have a couple of options. Being observant is going to be your best first technique. My sister is 25; I'm 27. I respect that she is an adult woman. If we would go out someplace and I saw her talking to a guy, I'd make eye contact with her and let her clue me in. She could tell me anything from "get me out of here" to "let this guy know you're here" to "don't spoil this."

Alternately, the guy might be overprotective and is not taking cues from his sister. Again, be observant. Did the girl seem annoyed that her brother had come over to interrupt? If so, she'll be less defensive if you anti-AMOG him. If not, then you might need to tread carefully.

It may sometimes be more appropriate to use anti-mother-hen tactics against an older brother. Be friendly, outgoing, likeable, and gain his trust. Make yourself somebody who he'll trust to go on a date with his little sister.

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Some vices miss what is right because they are deficient, others because they are excessive, in feelings or in actions, while virtue finds and chooses the mean.
Aristotle, Ethica Nichomachea

This.
Big brother wants his little sister to be safe but also with the best guy there is. It is definatly thin ice, on the one hand you have to show your the man and have to show big bro that you are good enough for his sister. To the same extent though, you have to be respectful to him or the little sister will get pissed off that you.
I don't have a little sister but I do have some younger relatives who I treat as a little sister. One, for example, is 16. If I see her with a guy I will nearly always go over and this is exactly the order I ask myself things:
Is she safe with this guy?
Is he good enough for her?
Do I trust him enough to leave them alone?

Now the first one is a pretty simple one to get around, don't give me the impression your a drug dealing criminal mastermind. I want to know you can look after her and your not going to get her into trouble that in an hour I will have to come and sort out!
Next I want to know if you are good enough for her. I will normally subtle push a guy to see how easily I can AMOG him. This is a real balancing act like I said earlier, if you don't fight back your a pussy and I don't have to do anything because you have already blown it. On the other hand, if you try and AMOG me to much, actually try to become the leader of the group I would take the guy back to pre-school in seconds (AMOG him so hard he lost all chance). The trick to this is finding where you can fit in, if the brother is alone, you want to be the 2nd most dominant guy at this stage. That'll show him your good enough for his sister but also have respect. If he comes over with people, you have to very quickly work out where those people stand with him. He might have his best friend there who is his normal 2nd, then you go to 3rd on the pecking order. Their might be a guy there he looks out for, and although that guy may be a weak target if you try and get above him the brother will AMOG you again.
I realise that was quite a long explanation, but I hope it makes sense!
Lastly, the "Can I trust him enough to leave them alone" is just a combination of the two but I would also want to see you have respect for the girl. I want to know that if she says no, you will stop.

Right, that's about it. Reading it back though, its not really just big brothers you need to treat in that way but really any protective guy situation. While obviously I would go harder into a situation with my relative I would still do the same thing with my close friends, basically anyone in my direct social circle.

Hope that helps,
Madals