Sister and a brother. but not boring ! nice and always helpful. smartest person(человек) in the wold. to all my questions. friendly нужно вставить

My family isn't large. I have got a sister and a brother. My family is small small but not boring, it's super!My mother is very nice and always helpful. She is the smartest person(человек) in the world. She answers all my questions. We are very friendly