The hotel beat the children.

Depending on the situation, the hotel has the obligation to ensure the safety of customers, so in this case, it depends on whether the hotel has fulfilled this obligation, such as posting slogans such as parents taking care of children, and whether the vase is placed in a safe position. If the vase is placed safely (generally speaking, that is to say, normal people can't foresee that the child will break the vase, such as putting it in the corner or the vase is firm and stable), and there are tips to take care of the child, then under normal circumstances, the hotel is not responsible.

Because parents are guardians and have the obligation to take care of their children, if there is no problem with the hotel layout, then parents obviously have to bear greater responsibilities. Unless the vase itself is placed, it is easy to break.