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You can apply for the right to look after financial and legal affairs or the welfare of someone else if they can't do it for themselves.
You can manage someone else's financial and legal affairs or their welfare if they can't do it themselves because they 'lack mental capacity' - this means they can’t make a particular decision for themselves at the time it needs to be made.
Someone may lack mental capacity because, for example, they have:
had a serious brain injury or illness
The law says a person must not be treated as unable to make a decision just because they make an unwise decision.