Have A Good Flight Why So Confused

Have A Good Flight Why So Confused?
Rosco and his wife sally boards a flight to Miami. 9 People on the flight have 2 kids, 4 people have 3 kids, and 6 people have 1 kid including Rosco and Sallys little boy Mich. 30 people are grown ups without children. How many people are on the plane to miami?
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1 - None. But there are a lot INSIDE the plane. 2- IDK, you don't say if the parents brought their children on the plane, you only say they HAVE 1, 2, 3 children. 3-Impossible to tell. For example, the 4 people who have 3 kids. Is this four moms and their 12 collective children (16 persons)? Or two married couples each of who have a set of triplets (10 persons total)?