Cont...
You would be better off claiming squatter's rights, the law used to require you to live at the property for 12 years, and then you could claim it as your own, but now you only have to have lived there for 10 years, though the land will not automatically revert to you anymore.
You will have to complete an ADV1 form registering your claim, and if that goes unopposed the land will be registered in your name. If his family oppose (which I am sure they will) the claim will almost cetainly rejected.
At this point the only thing you can do is to cling onto your little home for another 2 years, because after 12 years living there you can file another claim which will give you the land, whether it is opposed or not.
All the jargon is here:
http://www.propertylawuk.net/adversepossession squatters.html
If I were you I'd get the CAB to read it, because they tend not to be too specialised in these areas, (I had a problem with a co-tenant doing a runner and the CAB told me I had to pay their rent, when actually I didn't!)