Thank you!! Because my parents have a small family business for over 20 years continuously, so I just put they are business owner for that period of time under Personal History, and do not list any short travel (1-6 days each trip)
Just my opinion, I would put self employed for them from 2009 to present but if they went on vacation in between those times i would put it too only if they're away for a month or more. I think any activity that falls in the category whether they're studying, travelling, employed, in jail or retired should be declared in their personal history.