gift for sister and parents

Today, i'm so free. I don't have to work and I also completed all my homework. I'm sitting and think what I should buy for my sister and my parents as a gift. I came up with a lot of ideas such as cosmetics, sunglasses, and i pod. Finally, I could not decide yet because for buying a gift to someone is quite difficult because if you bought it for them and they don't like, you may be unhappy. I don;t know what other people opinions, but in my view, I have to figure out the appropriate stuff to them. Actually, I have not many choices because of limited of money. ahhahah. Another thing is that I should go to some places in the city to buy. Not just go online and find the stuff like this. The problem is I have no idea where in the city I should go. I'm new..