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Be a good role model for your sibling by doing well in your studies and following through on your commitments at home. Your sibling will likely take notice if you are diligent about doing well in school and are also able to keep up with your responsibilities at home, such as sports practice or household chores. Working hard on your own needs and responsibilities will allow you to also be a good mentor to your sibling, as you will have enough of a grip on your own life to support your sibling. Don't be afraid to fail in front of your sibling. Your sibling may respect you more if you show them you are human. It will also make you seem more relatable and honest. Another way you can be a good role model for your sibling is to try to maintain an active and healthy social life. Being able to connect with a group of friends can set a good example for your sibling and show them how to be social around others. If your sibling is struggling to make friends and connect with others, ask them to hang out with your friends for a night. This will help them feel included and allow them to learn how to be social by following your example. Be respectful when your parents speak to you and be polite when you are around other elders, such as your teachers or your friends' parents. Maintaining a good relationship with the elders in your life, from your parents to your teachers to your mentors, will help you develop into a good role model. It will also demonstrate the importance of respect for your elders to your sibling. A good role model is willing to admit when they are wrong and make a sincere apology for their mistake. If you make a mistake, you should be ready to apologize and acknowledge your misstep. Do this in front of your sibling to show them the value of an apology and the importance of being humble and honest, even when you are wrong. This will allow your sibling to understand that it is okay to make mistakes and that it is essential to acknowledge them so you can move past them.
Do well in school and at home. Maintain a healthy social life. Demonstrate respect for your parents and your elders. Apologize and acknowledge when you are wrong.