We gave DD and SIL a substantial sum of money, allowing them to buy a bigger house without adding too much to their mortgage. Unfortunately, I realised, through not having to sign that above mentioned document, that the money probably used for the intended purpose. It presumably gave them a safety net, but I was angry. That sum will not be 'recovered ' if the house is sold. I asked my solicitor if I could ask SIL to sign a document stating that if they were to part and sell the house, he would give DD 'that sum' before they split the remainder of the sale money. He said that could be done, but he couldn't be 'held' to it. We would have to rely on his goodwill!