Most of the time shops will specifically tell you that you are to do the shop alone. Sometimes a dining shop will tell you to bring one adult guest with you but their logic is if you're being surrounded by a herd you won't be able to focus on the details that a client wants. This is work and you could ask yourself "If I went to work at the factory (or where ever) would I bring the whole family in with me?"
Her Serene Majesty, Cettie - Goat Queen of Zoltar, Sublime Empress of Her Caprine Domain