Answers
In Greece, the Golden Visa only allows the right to stay. Colleges are private and public education is paid.
The son can enjoy the programs. It also depends on each college policy and not the Greek Golden Visa.
According to Article 20 of Law 4251/2014, the holders of the resident permit and their family members have access in Greece to public and private education analogously to that of Greeks. Regarding the other European countries and their educational institutions, the rules and the related fees depend on each country’s policy and the related universities’ conditions and terms for European residents or citizens.