Give a stream of consciousness and then the final answer. Michael Grant Ethan is Ricky's 14-year-old foster brother who ran away from their house a few years after stealing a knife from Margaret and Shaker. He first appears when he gets into trouble for sending naked pictures of his ex-girlfriend to everyone in his contacts, which ultimately lands him in juvenile detention. Margaret decides to take him in again, and forces him to go back to school. In season 4 he is forced to go to summer school and immediately gets into trouble for stealing condoms from the nurse's office. Despite his actions, Ricky still tries to install sense in him remembering his early days before he met Amy. He begins dating Kathy, who is pregnant with her ex-boyfriend's child. They decide to take their relationship slow, but Ethan has trouble respecting Kathy's boundaries. Such as when he meets the perspective parent's of Kathy's unborn daughter, and asks rude and personal questions about them. Kathy breaks up with him when her perspective parent's think he is too unstable to be around. Ethan later confides to Kathy that his biological father injured him when he was a kid, causing his distrust in adults. After meeting Kathy, Ethan tries several times to get advice from Ben on how to be a good boyfriend to someone who is having a child with another guy, but Ben show's no interest in helping him. In the episode "Holly Rollers", he is shown to be a talented piano player. Then him and Amy start getting closer and closer while Amy and Ricky get farther. He is portrayed by Michael Grant.

Based on this passage, secret life of the american teenager ricky's brother?
To answer this question, we should know that: Michael Grant Ethan is Ricky's 14-year-old foster brother who ran away from their house a few years after stealing a knife from Margaret and Shaker.
So, the final answer is Michael Grant Ethan.