Option 4 is ans.
By option elimination
As they asked minimum take first if no. of family is 2
Now try to Satisfy given constraint
Adult > Boy > Girl > Family
5>4>3>2 (We need this but the constraint each family is atmost 2 adults not holds here)
So now suppose if no. of family is 3
Now try to Satisfy given constraint
Adult > Boy > Girl > Family
6>5>4>3
Now 3 families each have 2 asults so total 6 Adults.
Each family 3 children so total 9 children (5Boys + 4 Girls)
So all condition satisfied with No. Of family =3
So Option 4 is Ans.