I've found it rather hard to follow your question but, as I understand it, I can't see that you've got any rights to the land.
You've headed you question 'squatters rights' but these only apply when someone moves into unoccupied property, so they don't seem to be relevant here.
There are certain circumstances when the ownership of land can be acquired by 'adverse possession'. However this doesn't seem to apply to your case.
Regrettably, I can't see that you have any rights to own or occupy the land unless there was a legal agreement between you and the owner or unless provision for this was made in a will.
Sorry!
Chris