Fat tummy

Xuan is so much into patrol cars and curious about what they are doing. Days ago, we were talking about the patrol cars and he asked if patrol cars will chase monsters too. Hubby and I told him the truth that there is no monster in the world but the cartoons he watches. He still believes that monsters do exist because the friends tell him so. The friends' elder bro and sis have the power to fight against the monsters. Poor Xuan being the eldest at home. So I asked, are they as big and tall as his tua ku? He said no. But tua ku has fat tummy you know...