Think about the times you have helped a friend achieve their goal. You may have run a few miles with them each day in preparation for a 10k. You might have stayed up late at night reviewing flashcards for a big test the next day. Or, maybe you encouraged a friend to travel and see their dreams through. These types of scenarios work great to answer this question.
"I helped my younger sister set up a year of travels abroad after she graduated High School. I did a lot of research for her and also helped a bit financially. I want to see her succeed and be happy."