Little rat-people

Trassel, Ofelia, and Philémon fly through the ventilation fan—using ice-cream parasols—and land under the bed in the cabin. When their father enters, they rush out and call out to him. However, he sees them as tiny rat-people and thinks he has gone mad. When he starts sweeping the cabin with a broom, Trassel and the children decide it is best to leave, and they tumble back through the fan. What will happen next?