Hi, thank you for your question. Just a bit more information required to fully assist you:
-Are you in England or Wales?
-What is the size of your mother's estate?
-When did she provide the money?
Thank you for confirming. A person is free to gift or use their assets and money prior to their death in any way they wish. However, sometimes, a gift made prior to death can be challenged if you can prove mental incapacity or undue influence.
Furthermore, if her estate is over £350,000 then the gift will be returned to the estate for inheritance tax purposes only and your sister may be liable for this.
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Did your mother register an interest on the title of the property?
Thanks. Again for you to have a successful claim you would need to prove that there was either mental incapacity or undue influence in the use of her finances
You should check here: http://solicitors.lawsociety.org.uk/ and seek a private client - probate area of practice