Sorry to hear about your father's passing. I am sorry to hear that he never used this once. If Diamond claims that he must pay $1000 to transitions program for paperwork ignore it.
Do nothing to take ownership on this account or pay money to Diamond. The US has a 3 year statute of limitations. If you pay ANY money to Diamond it restarts the 3 year clock and may implicate you as an owner.
This account is not yours and you need your lawyer to renounce ownership (write a letter) of this portion of the inheritance to Diamond and to the probate court in the county where the Diamond Land trust resides.
Since he was not based in the USA and you are not here, if you do nothing, ignore all the threats and letters, it will fall in to foreclosure and they will take it back without costing you a penny. Best not to talk or write to Diamond/Hilton Vacation Club because they may interpret as you objecting to foreclosure. (see below for Florida law)
Most estate lawyers are unfamiliar with timeshare law. Please share this link below with your lawyer if you decide to get legal advice. If the Diamond Collection trust is based in Florida: This link is for deeds and land trust are unproven in the US law.
Florida – FL, inaction or non-objection results in estate, anti-deficiency foreclosure,
but objection leads to judicial, deficiency action: http://www.leg.state.fl.us/Statutes/index.cfm?App_mode=Display_Statute&URL=0700-0799/0721/0721.html
https://www.flrules.org/gateway/ChapterHome.asp?Chapter=61B-37
@TUGBrian @DeniseM @CalGalTraveler take a look. This weekend, I’m creating a spreadsheet with official links to states’ timeshare laws, as well as their statuses as to non-judicial, anti-deficiency foreclosures. In the meantime, I will just keep adding notes. * Legal Disclaimer: This list...
tugbbs.com
Datapoints: Given you live internationally they cannot report you on a US Credit report. So very unlikely they can take any action against you - especially since you are not the owner on the timeshare. Same with your father's estate. the estate does not need to apply for credit anymore so does not matter.
(The "1" below was probably a US resident.)
View attachment 82266
Two more data points
tugbbs.com
Please report back to us what happens to pay it forward to others.
Good luck.