Either you misinterpreted their words, or your father and brother both need to brush up on their chemistry.
A solution is, by definition, a homogeneous mixture.
http://en.wikipedia.org/wiki/Solution
The molecules will evenly disperse because that is the only way they can stay in solution. If they clumped up or settled, the hormone would crash. It's similar to heat conduction, where heat will try to go from high to low in order to balance out.
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