On the basis that your daughter is putting in a larger deposit than her boyfriend, it would be normal for their Solicitor to draw up a Declaration of Trust, so your daughter's appropriate share is protected. So, if for example, she is putting in £40,000 more than him, this Declaration will state that as and when the house is sold, your daughter is entitled is entitled to the first £40,000 (with or without interest) from any Sale, with the balance being split equally. This is far safer for your daughter and will of course give her immediate protection, should they fall out at a later date.
She should raise this with her Solicitor who will be able to run through everything with them.
I hope this helps.
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