22 year old managing 2 STR of parents and plan to buy own rental in less than 2 years

[Bien Ven H. Santos Jr.]

Hi! Im from the Philippines and currently managing my parent's 2 Condominiums and runs/manages it as STR. Currently, we are looking to buy a house/duplex/triplex near the university for my sister who starts college in 2 years. We plan to have it cashflow and have it ready by the time she is in college.

As of right now, my father is the one financing these deals and Im the one making it cashflow while being a full time college student. I want to own my rental property in less than 2 years also. 

My question is do you guys have any advice on how to convince my father/investors to invest in me? What can I show to have their trust that I can make it cashflow while being a student?