Describing an important person in my life (Paragraph one)

This week in my Practicas de Redacción class I had to create a paragraph to introduce the topic sentence of an essay, in this case: My sister Cristina:


She´s one of the most reliable person that I know, she´s been the shoulder against I´ve cried in many times,  she´s truthful and mature, the kind of person I want to be in the future, she is my sister, Cristina. Despite of being older than me, we have many things in common, no matter what we are talking about, because we always(or almost always) have the same thoughts.