Don't ask for money for your ticket or a top up. We are not all sons of Greek tycoons.
Here are some ways:
I. Study in Greece
Try Deree College (undergrad) or ALBA (MBA). Look up the process online. I can advise you on how to apply, but for a fee.
II. Get a job in Greece
In English, French, German, Spanish, Portuguese and Scandinavian for US firms (did that too in 2016-2017):
2) Apply for a basic McDonalds job via:
These are only a few jobs in Greece. I pledge to create real jobs in Greece.
Please also create a free CV/resume of yours in:
use email@example.com when it asks you for my e-mail address.
III. Get the Greek you like a job in your own country, in this case the US:
With you father's company or your own.
My CV is:
https://www.linkedin.com/in/nickpanayotopoulos/ Get a copy and show it to your dad.
IV. Start a company in Greece (bar, etc):
I can help you start it in Greece or Germany or the Netherlands because I have a business degree and management consulting experience.
MIT '85, Northwestern '87