Here are some suggestions. I wonder what grade are you in?
...=> Whenever you need attention, a family member will be there for you. For example, when you're sick or when you need a person to share your happiness.
=> In addition, in childhood we do create strings with our brothers and sisters (I'm not so sure for this sentence, what is "do create strings"). So I have a real bond with my brother, Marcos; he is a hero to me.
...=>Marcos is a 28 year-old man, who studies in a medical university in Campina Grande. Since childhood, he has taken care of 'how other people feel'. By the end of the high school, he decided to apply for medicine and nursing. Although, he didn't pass on the medicine exam, he passed the nursing exam. I remember that my parents told him to go on, but he had always wanted to be a doctor. After he had finished the courses for nursing, he tried to reapply for medicine. At this time, he was at the top 5 of the university.
=>In childhood, I remember that he saved my life several times from hard situations. One time our mother told that I could not go play football with my friends until I had finished my homework. It was a lot of science homework that I didn't like the subject and the teacher did not explain clearly. So I remember to think: "I will go play and comeback before the time our mom goes back from work". However, our mother came back earlier than other day because the company that she worked was being painted. When she saw that I did not do my homework, she took me literally("took me literally" I don't get it. Maybe you mean scold you?) by the ears. At the moment,(we know that you was at home) Marcos was my main lawyer; he told my mother that the subject was hard and that I didn't understand it in the class. Ultimately, he saved me from being whipped.
Today, Marcos is married Alba, and they have a beautiful child, Pedro Henrique. I believe that his felling of 'take care' is still pointed and he will pass it to my nephew. For these reasons above, I consider my brother is my hero.