In a real life setting with three sisters, one will always be different and will be the one with the reserved attitude. This one will always need protection from her other sisters because she isn't as exposed and experienced as they are. Her two other sisters will always come off as wild but the love that exists amongst them will be comparable to none anywhere. The model in the middle here can be likened to the one that needs protection all the time and her sister are on either sides of her acting the Guardian angels. I relate to this. I was that way with my sisters; the gentle easy going one who would run under their protection when things got a a little bit rough.