I wouldn't know.
Not being the manager of the concessions or a vendor at Comerica Park, I have not memorized the appearance of the containers of Comerica Park's drink inventory and I can guarantee you that the father in this case had not memorized the appearance of the containers of Comerica Park's drink inventory either.
Have you memorized the appearance of the containers of Safeco Field's drink inventory?
If you ask for a "lemonade" for your 7 year old kid at Safeco Field, would you know whether, say, a plastic cup that says "Rainier" on it contains a local brand of fruit juice or a local brand of beer?
Without looking at the fine print, which logo is the logo for Rainier Beer and which logo is the logo for Rainier Fruit Company?
It's quite obvious to everybody that drinks beer around here. Why is it not obvious to most FReepers that have never visited Washington State?