Delegate my parents for the visa

Hello! I am an Italian student who is now studying in the Netherlands. Is it possible to delegate my parents back home on my behalf if I send them my passport and all the necessary documents for the entry permit procedure? In this case since my residency in the passaport is in Italy should I write the Italian one or the new Dutch one? Another question: I have heard about people having their visa rejected because of turkish stamps on it. I have been to turkey 3 times since 2015 because my sister lives there. Should I write a statement saying why I visited the country?
Thank you in advance