Which of these signs can you handle the most - Sagittarius, Scorpios or Leos?

I have three sisters, a Sagittarius, Scorpio and Leo. Ages are in that order. The Sagittarius cannot take any criticism at all. Im not sure whether it is that she thinks too highly off herself or accomplishments or something else. The Leo is incredibly vain and is always trying to perfect herself. She takes absolute hours to get ready and can spend hours checking herself out in the mirror. I've learnt to deal with it because even so, she loves to make others feel beautiful. My Sagittarius sister does this too but with my Leo sister its much different. She just wants everyone to be happy and feel as good as she does and makes a conscious effort. My Scorpio sister and I have a very very turbulent relationship. She is so sure of herself, thinks she is terrific yet is so easily jealous of the other two. Most of the time we don't get on. I find that she is very spiteful, resentful and doesn't really have good intentions. I have also noticed she tends to stare at people when they are not looking, a really nasty jealous stare. It's scary to think what she is thinking. We just do not get on at all. I can handle the Leo the most which is funny because she is the most annoying, then the Sagittarius, then the Scorpio. My mom and dad are Gemini and Aquarius and we are very close.