Suprisingly have seen one case approved. Don’t quite understand how but it was but some of these medical approvals are pretty questionable. Sponsoring parents isn’t as simple as getting a lawyer. Details about PGP2020 will be released by April. Only a portion of parents who qualify actually get selected. It takes 6 months to 2 years to sponsor a parent and they need to pass a medical. Given that your father has lung cancer his chances of being inadmissible are pretty high. Would research PGP program. This is not a quick process and your parents may not even qualify. Would explore medical care options in Europe.