How can my sister live with her 15-year-old brother when traveling?

According to the inquiry of the study abroad network.

1. When my sister takes 15-year-old brother out for a trip, just book a standard room with twin beds. There are two beds in the standard room, one for brother and one for sister, which can take care of each other.

2. When my sister takes 15-year-old brother out for a trip, she can book two adjacent rooms, which is convenient for contact. Attention should be paid to the safety and legality of the hotel.