Article 49 Marriage, families, mothers and children shall be protected by the state. Both husband and wife shall have the obligation to practice family planning. Parents shall have the obligation to raise and educate their minor children; adult children shall have the obligation to support and assist their parents. Infringement of the freedom of marriage is prohibited; mistreatment of senior citizens, women and children is prohibited. Article 50 The People's Republic of China shall protect the legitimate rights and interests of Chinese nationals overseas as well as the lawful rights and interests of Chinese nationals who have returned from overseas and of the family members in China of Chinese nationals overseas. Article 51 When exercising their freedoms and rights, citizens of the People's Republic of China shall not undermine the interests of the state, society or collectives, or infringe upon the lawful freedoms and rights of other citizens. Article 52 Citizens of the People's Republic of China shall have the obligation to safeguard national unity and the solidarity of all the country's ethnic groups. Article 53 Citizens of the People's Republic of China must abide by the Constitution and the law, keep state secrets, protect public property, observe discipline in the workplace, observe public order, and respect social morality. Article 54 Citizens of the People's Republic of China shall have the obligation to safeguard the security, honor and interests of the motherland; they must not behave in any way that endangers the motherland's security, honor or interests. Article 55 It is the sacred duty of every citizen of the People's Republic of China to defend the motherland and resist aggression. It is an honorable obligation of citizens of the People's Republic of China to perform military service or join the militia in accordance with law. Article 56 Citizens of the People's Republic of China shall have the obligation to pay taxes in accordance with law. Chapter III State Institutions Section 1 The National People's Congress Article 57 The National People's Congress of the People's Republic of China is the highest state organ of power. Its permanent organ is the National People's Congress Standing Committee. Article 58 The National People's Congress and the National People's Congress Standing Committee exercise the legislative power of the state. Article 59 The National People's Congress shall be composed of deputies elected from the provinces, autonomous regions, cities directly under central government jurisdiction, special administrative regions and armed forces. All ethnic minorities should have an appropriate number of deputies. The election of deputies to the National People's Congress shall be presided over by the National People's Congress Standing Committee. The number of deputies to the National People's Congress and the procedures for their election shall be 10