When I was very ill, I distributed my property among my offspring and put everything in writing. However,…

Answer

Writing a document is not a sufficient proof of ownership of the property by your sons and daughters. That said, if you had given them the property and they took possession of and control over it, it is rightfully theirs; you have no right to demand it back. But, if there was no gift involved at the outset, or they had not yet taken possession of it, the property should remain in your ownership and at your disposal.