Yes, but legal education is needed. It is illegal for an elder brother to discipline his younger brother in an unreasonable way. Legal basis: Article 234 of the Criminal Law of People's Republic of China (PRC) intentionally hurts another person's body, and he shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance. Whoever commits the crime mentioned in the preceding paragraph and causes serious injuries shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years. Whoever causes death or serious disability by particularly cruel means shall be sentenced to fixed-term imprisonment of not less than 10 years, life imprisonment or death. Where there are other provisions in this Law, such provisions shall prevail.