9. Silence is Golden?
This one could be interpreted as an extreme, strange take on “respect your elders,” but the OP’s explanation definitely cast it in a much creepier light. This family also apparently poured sugar in their Coke, which sounds absolutely horrible. Coke is already too sweet, why on earth would you add more?
At this point, you might as well just eat the sugar. And probably schedule a regular doctor’s appointment. You’re going to need a lot of them from the array of health issues that come up from eating too much sugar.