The purchase of commercial housing (including mortgage housing and second-hand housing) can bring a hukou, but citizens who already have a hukou in this city cannot bring a hukou when purchasing the above houses. Before the real estate license is issued, according to the relevant regulations of the municipal government, the household registration is not allowed to move in. During or after studying in Zhengzhou, if you want to move your foreign hukou into this city, you must be a nationally recognized unified enrollment, and your education must be college or above. Previous foreign graduates must work in Zhengzhou for more than one year if they want to move their registered permanent residence to Zhengzhou. When handling, it is a collective account and can be settled directly. Non-collective hukou can be placed in the talent exchange center or under the name of immediate family members. Those who move their registered permanent residence into Zhengzhou due to job transfer, including unit exchange, affiliation within the system or assessment of personnel and labor departments at the time of transfer, can apply to move into Zhengzhou registered permanent residence. In addition, if you have a college degree or above, have worked in Zhengzhou for more than one year, and signed a labor contract with the employer for more than one year, you can bring relevant documents to the household registration hall in your jurisdiction to go through the formalities of moving into Zhengzhou. When purchasing commercial housing to apply for Zhengzhou hukou, the municipal government expressly stipulates that you must be a direct relative to apply for Zhengzhou hukou. Immediate family members include their own children, spouses, parents, sisters, nephews, nieces and nephews. For the purchase of commercial housing with registered residence, you can add 1 person for every 30 square meters starting from 56 square meters. However, there is an age limit for relatives to move their hukou to Zhengzhou. The age of minors should be controlled below 16, and the age of school students should be relaxed below 18. There is no age limit for buying a house with an account. Q: My daughter-in-law and son gave birth to a child without a marriage certificate, and the family planning department also fined them. Now that the daughter-in-law has left, how can I go through the formalities for the children? Answer: You can go to the registered permanent residence Registration Form of the police station under your jurisdiction and fill in the information truthfully. If you get the household registration hall in your jurisdiction and you can't prove that the child is your son's biological after inspection, you need to do a paternity test to prove that the child is your biological. According to your situation, you can also take the fine and account opened by the family planning department at that time.