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Hello, thank you for the question. It's a very interesting one.
Practically speaking, is it worth it to move the building? What sort of structure?
Was there ever any communication between you that you'd be paid for your work and/or reimbursed for your costs?
When did you complete the building, and when did you separate?
I'm back, sorry for the delay. I was away from the site for a bit.
I'm afraid that I don't have good news for you. Don't shoot the messenger.
In the absence of a contract, items transferred especially between family members are considered a gift. I don't see how you can make a claim of any kind of ownership or possesory rights to the building.
You're not on title to the property, and what you built is attached to the in-laws' property. It's theirs. Unless you have any proof that they were going to reimburse you for materials or pay you for your labour, you have no rights to simply take the building. You could try to sue them under contract for unpaid work, but without a contract of any kind or evidence of such I doubt you'd get far.
Are there any more details which might change my opinion? If so then please reply with them. If not, then I hope you'll give a positive service rating please.