How to prove that I will return home after a Schengen visa (I am a minor)

I am a minor and I want to apply for a visa for Italy (currently residing in Kenya). I want to visit my sister who lives in Italy. She owns a house and is a permanent resident. She got divorced about a year ago. The requirements for the visa application are that you must prove that once you receive the visa, you will return to your country of origin. Could you give me some tips to prove that? (Also tips on how to make sure you get the visa.