I am 1 of 5 Gemini's in my family and we are all very different. My Sun sign is in Scorpio, so I have a tendency to be more secretive, less verbal and more cerebral. One thing that I can say the 5 of us share is, the distain in owing anyone anything. I can only speak for myself when I say that I need to feel a sense of personal freedom in order to stay put (camping, spontaneous picnic in the park, or just a walk around the block). Creative freedom also applies.
All 5 of us love four legged creatures. I can't walk through a neighborhood without talking to all of the cats and dogs who decide to follow me. And given the right circumstance, I think that Gemini's make great parents. Some call me selfish because I didn't want to take that journey. The truth is, that early life lessons left some permanent scars. However, I am an optimist and a spiritualist. I'm more sensitive than I let on to be and I've learned to let others make their own mistakes ... No, I told you so!
The last thing that I will say is this, "find out what planets govern your Gemini and then listen to the story of how that person was raised (nature/nurture)." One characteristic that will show up in all Gemini's is one of originality.