I'm very close to one of my sisters and clash with the other one.
I think it's a personality clash with her though. We are always bickering and arguing over something and can never have a proper conversation with her. We had a falling out two years ago and are since back on speaking terms. I think we just tolerate each other now.
With my other sister, we get on like a house on fire. We have the same personality, sense of humour and could just chat and talk for hours. Even as kids, if we had a fight over something, we were talking again two minutes later and are even like that today. She's great fun on nights out too, if she's not falling over
My brother, the baby of the family, couldn't be anymore laid back if he tried. Nothing phases him. I might not hear from him that often but when we do see each other, we chat away. Losing our mother when he was 11 was very tough on him but he has grown into someone she would have been proud of.