Is it reasonable that the hotel does not allow children to stay?

Unreasonable and illegal. Hotels do not allow adult children to share rooms with their parents, which infringes on the legitimate rights and interests of consumers.

First of all, legally speaking, there is no law prohibiting adult children from living with their parents. For private rights, the law can be done without prohibition. The Law on the Protection of Consumer Rights and Interests stipulates that consumers have the right to choose their own goods or services, choose their own varieties of goods or services, and decide whether to buy or not to buy any kind of goods or accept or not to accept any kind of services. Hotels do not allow adult children to share a standard room with their parents without any legal basis, which obviously infringes on the legitimate rights and interests of consumers and is illegal.

It is also illegal for hotels to refuse on the grounds of "general industry regulations".

As a service place, hotels should provide better services for customers and meet the actual needs of consumers. It is obviously illegal for hotels to refuse based on the general regulations of the industry. In the absence of legal provisions, it will not be legalized just because there are general provisions in the industry. After all, the reporter called the Beijing 1 2 3 4 5 citizen hotline to inquire about this matter, and the staff also answered the specific number of hotel guests. There is no uniform regulation, but the staff of China Tourist Hotel Association said that the association has no regulation. It is obviously illegal to rely only on the common practices of the hotel industry without legal provisions and industry norms.

As consumers, when their legitimate rights and interests are infringed, consumers can report and complain to local consumer associations; In addition, since the consumer has paid the fee on the online platform, the two parties have legally formed a contractual relationship, and it is obviously a violation of the law and the contract that the hotel refuses to let the consumer stay (even if the contract stipulates that adult children are not allowed to stay with their parents at the same time, I think this clause is invalid). As consumers, they have the right to take up legal weapons and bring a civil lawsuit to the people's court, demanding that the hotel fulfill the contract and protect their stay.