It's worth a try

Some American asshole refuses my family permission to even visit my ancestors' castle in Scotland.

Those old estates are heavily mortgaged and have high taxes. You probably owe a lot of money. Please inquire so they can give you your bill to pay.

to be practical I couldnt show up at the farm my grandfather owned and declare it mine.Maybe things are different in England. ANd now I see where you get your beautiful complexion

Yes, you've watched too much fantasy tv.

It couldn't hurt to fire off an email asking if the family has any castles lying about that they don't need although they may send you an outstanding tax bill along with the title to a ruin in some English backwater. Be careful of what you ask for, you just might get it.

You would need documentation that you have legitimate claim. We tried. My Dad has very ancient documentation that we own land. Unfortunately it isn't enough. Land and property ownership has changed hands over many centuries, so really...you'd be lucky.

Unfotunately, if you go back far enough, EVERYONE is related to somebody prominent. And unfortunately again, you might not be, because 1) it only follows one male line, not the dozens of other possibilities, and 2) there were no DNA tests then, so many a lady had a giggle when she produced an heir who was actually fathered by another. We could all stake a claim and justify it by these means, but who would want to? They exploited and owned the serfs who worked for them, which is why they became rich and "owned many estates". Most of the "prominent" families in English history got their prominence by foul means - slavery, corruption, exploitation, killing anyone who spoke against them, selling their daughters etc., so you might want to think twice about that. It's not necessarily something to be proud of.