According to the regulations of the Chinese railway department, children under 1.2 meters can ride the train for free, but they need to purchase a half-price child ticket. Therefore, if this parent brings two children, seven years old and one of them is less than 130 centimeters tall, he needs to buy two child tickets (including children over 1.2 meters tall) and one full-price ticket.
As for whether there are special B&Bs nearby, it depends on your specific location. Because different cities and regions have their own specialty B&Bs, it is recommended that you search for specialty B&Bs near your location through online travel platforms or using map services. Usually these platforms will provide detailed B&B information and user reviews to facilitate your choice.