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On the basis that the Seller does not have any paper title to this additional land, you have 2 choices-
1. Ask the Seller to apply for possessory title. This is likely to take at least 10 weeks from start to finish.
2. Ask the Seller (and it would need to be the Seller, as oposed to another family member) to sign a declaration or Statement of Truth, confirming the length of his possession of the land and confirming for what purpose he has used the land.
The 1st option would of course be best in an ideal world, but time may not be on your side.
With the 2nd option, provided you have a Statement or Declaration from the Seller (it has to be from the owner), you would be handed the original on completion, and you then would be free to apply for possessory title as and when you wish.It would of course be a lot quicker than option 1.
I hope this assists and sets out the legal position.