You would only need to disclose anything that you personally own (i.e., have signing authority on). If you're not listed as a co-owner of your father's account, then there's no disclosure.
The property owned is another matter. If it was owned in your name, then maybe disclosure is required. The sale would generate proceeds which, then, would be disclosable.
Nowadays, that $10,000 limit seems to be $100,000, at least for simple, typical foreign bank accounts. Uncommon things like real property, business capital, stock or share ownership, and so on are another matter entirely--of course when in your name or when you have signature authority.
All very good questions!
