We don’t arrange wills or lasting powers of attorney, so you may have us mixed up with another company. We can however answer your question for you.
Whether you would be allowed to do this or not would depend on the state of your sisters mental health and whether she was aware of the nature and quality of her actions. There is no point whatsoever in getting something in writing from her to agree if a medical expert would not say that she was aware of the nature and quality of what she was agreeing to.
You need to either get a medical professional to write a letter that confirms that she knows what she’s doing and get a letter from her to say what she wants to do or, if you cannot get the medical professional to do that, then you need to contact the Court of Protection who will then say whether you are allowed to do this or not.
Unless it is a gift which your sister would normally be in the habit of making, or if it was going away a substantial amount of her assets, it is unlikely that the court would agree to make the gift.
It is not really a tax issue although depending on the amount of the proposed gift, there may be inheritance tax ramifications if your sister does not live for a further 7 years.
Can I clarify anything for you?
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