Parents owned a restaurant from when I was in third grade to end of ninth grade. Spent all my time after school and weekends there, helping out when needed. Taking orders/restocking stuff/etc.
Yes this can be a useful detail to demonstrate how to deal with the responsibility. It will have a positive impact on your application. But all it needs is to be written in a good essay. It is a good topic and will have an overall +ve impact
Yes, of course. Working in the family business to help out always looks good on an application.
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Essay as in a supplemental essay, or the personal statement one?