Mystery shopping can be stressful with a family or with friends as you must wait to be asked things, ask specific questions and sometimes order specific dishes. It's not as easy as you think. An example would be to wait for the server to offer condiments and not ask for them. You must allow them to offer first and then ask. Basically if you don't let them offer then you fail the shop and you won't get paid. I have had a few shops that were queried on very specific interactions, so please don't everyone think it's a jolly and easy all the time. I had a friend who was over the top once and wanted to order more things, when the instructions specify certain items (starter and main or main and dessert only) and again the shop can be refused if you did not adhere to the instructions.